Simon Frey Open Link List

RAG framework

Zero shot video segmentation model which seems to outperform SAM2

Find cites for LLMs responses. Quite interesting for advanced RAG usecases, where you don't want to rely on the LLM just returning somewhat invented cites.

Run your own AI cluster at home with everyday devices (e.g. a few mac minis m4)

Great low-cost google maps scraping service. Good if you are looking for cold-calling contacts

Online Drawing board (best to use with a graphics tables)

SmolLM2 is a super small LLM by huggingface. Works quite great for english textg

Nice read on how to get more document level context into a single embedding vector

A simple, easy-to-hack GraphRAG implementation

Graph based page-rank. Implementation of the paper

Graph based RAG framework, extracting entities

Golang tool to convert html to markdown (neat for llm website usecases)

Independent analysis of AI models and API providers

Python AI Website scraper

OpenSource PDF to markdown converter ai

FOSS german TSS engine

OpenSource spreadsheet engine

Golang vulnarability checker

Capability analysis CLI for Go packages

AI tool to extract structured data from documents

List of directories where you can submit your startup for backlinks

Download movie and TV Series subtitles, great for playing with it with LLMs

Convert PowerPoint or Video to the SCORM format for elearning

Programming library to interact with open source smartring

Twitter account sharing latest AI papers of the week

Convert Markdown to Mindmaps. From lists and header structures. Amazing if you - like me - live in markdown.

Example texts for copywriting

Collective that tries to build own medicine. I mean it's crazy, proppably illegal and might be harmful to your body, but it is damn interesting nevertheless

DOM to Semantic-Markdown for use in LLMs

Wordpress Plugin to programmatically change text on your page

Notion alternative, that is a lot cheaper, and can be self-hosten

Video segmentation model

Library that optimizes inference memory usage

Security Questionnaire Automation to get SOC2

System to run LLMs in a distributed (multiple computers with GPU) manner

Tool to find a lot of adjacent topics to a keyword. Great for in-depth exploring a topic

A Gradio web UI for Large Language Models

Kubernetes metrics exporter is based on this

Nice little FREE QR Code generator

Rent idle CPUs from other companies

Distribute and run LLMs with a single file.

Tool designed to streamline the fine-tuning of various AI models,

OCR in 90+ languages

OCR model that converts images or pdfs containing math into markdown and LaTeX

Token price estimates for 400+ LLMs

API for LLMs to load from the web/read the web

Compare token price against LLM quality to find best bang for buck

One-time payment balsamiq cloud alternative

Hugging Face tutorial on how to build a RAG evaluation pipeline

Open source computer vision tools

One Embedding Space to Bind Them All

Library to scrape webpages in formats that are easier for LLMs to interact with

Proxy to secure your intranet behind it

Free computer vision course

Visual model for image to json

Free deeplearning course

Loom alternative with application tagging in browser

Rent Idle GPUs for cheap

A simple and to the point classless CSS stylesheet

Data cleaning / categorizing with LLM

JavaScript Library to display confetti animation

RAG platform with a LOT of ready made plugins

German ollama model for chat use case

Matching platform for german co-founders

Tools for merging pretrained large language models.

Easy fine-tuning for 100+ LLMs

In-memory OLAP database

Europenan Foundation models trained by the university of turku (finnland)

Train foundation models for chat towards other languages apart from english

A LLMs quantization package based on GPTQ algorithm.

A question-answer dataset for finetuning embedding models

Massive Text Embedding Benchmark to compare models for NLP tasks

Kill orphan child processes. Love the starwars pun

Open-Source & Free AI image upscaler

Take potentially dangerous PDFs, office documents, or images and convert them to safe PDFs.

Library to find face similiarity

Deepface is a lightweight face recognition and facial attribute analysis (age, gender, emotion and race) framework

Multimodal vision understanding model

Data annotation platform for finetunining on object detection

ISBN based API for book data

Product analytics / tracking tool. Can build funnels

Run your unit tests in real docker environment. Docker all the things!

a list of disposable and temporary email address domains to block in your email forms and logins

API to tell browser which sites to prerender. This helps for faster pageload times

Preview how your metatags or your website look in different format

A go library for computing the proximity of the HTML pages. The implementation similiarity fingerprint is Charikar's simhash.

Search emails from a domain through search engines

List of all domains globally

Tool to identify SEO content GAPs and close them

Free email course on SEO

JS library to make your website appear instant

Lists all possible top level domains

A list of all (globally) active domains. Decent price

Make your website look like a LaTeX document

List of 100 biggest shopify stores. Especially the "how to" section is interesting

OpenSource Data Warehouse (column database)

Displays a graph showing how phrases have occurred in a corpus of books

Website with a nice overview table on different machine type pricings in google cloud

Sniper Link is a free tool that increases email confirmation rates by showing a button that directly opens the user’s email client.

Website with a lot of copywriting examples

Token-based keyword research tool, kinda neat, that you don't need a crazy expensive monthly subscription

CLI tool to run whisper locally on your mac

Linux pdf tool

Funny little website, that compares different map sizes. E.g. how big is germany compared to other countries

YouTube research tool

Tool to A/B your youtube thumbnails, simple but effective

Free hosted stable diffusion to play around with

Open source tool to build RAG for company internal tools. Already has quite a few integrations

Platform to create ad creatives that look like user generated content

Nice explainer how different SQL joins work

Free prompt gallery to generate awesome images and copy over styles

Browserextension to automatically build openapi spec for the website you are using. (nice for building a web scraper)

Book to learn about deep learning

Patrick Campbells sheet on emerging trends. Check it out for startup ideas to bloom in your head.

Patrick Campbell on how to best raise prices

Guide on how to write prompts for LLMs

Model that allows you to clone a voice into any language. e.g. your german voice into english. Super fascinating and interesting for translating podcasts/youtube video automagically

Free MIT lecture on how to get deeplearning models smaller and faster (to run them on local devices)

Super interesting reads about CFO topics (M&A, etc.). Especially for me as tech nerd

Get a machine learning question every day. Helps you to continue learning

Golang static security linter tool, to figure out what high-privileged operations your used go packages do. Wants to help prevent supply chain attacks

Service to help you validate your business ideas for 199€. Not used it yet, but seems like this actually can be a good trade

Great visual explainer on how the RAFT consensus mechanism works. If you develop distributed systems, check this one out

Cute explanation of how to speed up your deep learning process, or actually, explaining what makes it slow

Nice component lib for tailwindcss

RUST lib to calculate distance between vectors

An easy to use package which transforms text on the fly (did write smth like this a few times, but easier to get it from x)

ffmpeg frontend for lossless video/audio editing

Python library to detect scene changes in videos

Optimized Go Compression Packages

Open source data warehouse database. Snowflake alternative

Company to help you to become SOC2 ISO27001 compliant as software cmpany

Free prompt engineering guide

Site to find grants for your AI projects

Cheap animation editor

Python library to link somewhat alike data points to each other

Blogpost on how to build llama in a tiny version for yourself

Free Loom alternative. With Linux client

Another gallery of prompts for major AI APIs

Challenging CS algorithms and data structures every programmer should try

Tool to record cli tool demos

Package progressive web apps for ios and android

LangChain to combine multiple AI APIs together

Guide on building nice to interact with interfaces

Golang OpenCV bindings

Screen recorder for macOS, great to build neat product demos

Webapp producttour javascript library

API to check messages/comments from your service against if they are spam

A way on how to force a LLM to answer with facts, and prevent halluzination.

YouTube channel for learning about AI

The top 1 million websites, based of the CrUX data

Learn to use jsonnet

Amazing post by the wolfram alpha guy about how ChatGPT works

Captcha bypassing service if you got to scrape the web

Blog about life on a north-pole research station

api traffic analyzer for kubernetes

A company that helps you to bill through AWS and GCP cloud marketplace. Great if you sell to big corps, as they don't have to jump through hoops to get their budgets approved

Documentation by OpenAI on how to use ChatGPT better

Test website to work on a broken (sad) server and repair it. Great to sharpen your linux skills

Tool to show infra cost in GitHub MR. Great to detect increased potential cost

t Article on how to bypass scraping protection

Stanford CS 168 basis course

postgres connection pooling

Blog about leadership

List of mental models. No clue what you really need it for, but apparently people find this kinda things important

Dedicated Linux to run kubernetes nodes

In-depth PDF book on how to craft prompts for DALL-E 2

Tool to A/B test your prompts in production

Gallery of prompts for major AI APIs

Use WIFI "go away" packages to push deives of the wifi

Guide on how to market to developers on twitter (can be used for linkedin as well)

Article about happiness in life

Longform articles

Great articles and essays by the world's best journalists and writers.

Curated list of longform articles

Great writer with interesting articels with topics across the board

Timeless articles from the belly of the internet

Service that shows you what parameters of your device can be used for fingerprinting

The best known course for starting in the AI/deeplearning space

Collection of articles for nice programming projects. Learn how to programming X in your favorite language (e.g. a fulltext search)

Open source load testing tool by grafana

Add your service widget to automatically have nice looking embeds in all major services (e.g. slack spotify player when you share a spotify link)

Online pentest training. Hack into a VM with increasing complexity

Great for memeing topics in your industry and share on social media

Online radio for programmer music

Free Headless CMS to JSOn documents

Embeddable roadmap into your product. Let your users vote on what to build next

How to call rust functions from golang

AVIF library for golang

Domain dropcatching service

Domain dropcatch service

Domain dropcatch service

Domain Dropcatch service

Guide on how to catch dropping/abandoned domain names for your next great side-hustle

In-depth guide on how to use the browser `.sendBeacon()` API to send metrics data asynchronosly

Deep-dive on the golang garbage collector

Vector database written in Golang

This playground allows you to learn about systemd interactively, right in the browser

As GitLab is a remote company they have a lot of experience in remote leadership. This is their massive handbook on how to do that best

Joel Spolskys guide on how to interview for engineering positions

Manifest of the SRE team at Deliveryhero on how they operate. Kinda nice basis to copy to build your own one

Nice little article about a few tiny nitpicks with golang

Open (free) index of podcasts. Great for building your own podcast app/service

Nice MicroConf Talk about how to find your first 100 customers

Nice tweet on how to tweak your newsletter landingpage to perform better

Typesafe UUID alternative

Blogpost by andreesen on that you as a CEO either have to feel the pressure or apply it down your chain

Story about how amazon bets on things that won't change to make its fortune

Build your own LoRA network from scratch

Golang library to interact with the fediverse

Really nice 0-1 guide on how to build a chess engine

auto animate tool for easy JS animations

JavaScript library to simulate different kinds of color blindness

Open Source map data. Basically an enhanced OSM dataset

VPN solution based on wireguard, kinda open-source alertnative to tailscale

GitHub repo with list of prompts for widely used AI products

Justin Jackson writing about why he ventured into Entrepreneurship and why it is super important to keep in mind why you are doing it.

Neat little tool that converts a HAR export to swagger doc. Basically means you can surf a website and get a API documentation afterwards for it

Guide on how to use the nix package manager

This is by far the best explanation on how mechnical watches work I've ever seen. So much great visuals and animations in there to clarify things

Little online tool for fast foto metadata checks

Actually it is an analytics platform with A/B testing and stuff, but what is super lovely is their landing page. Check it out, it is so well crafted. Techie but not being overwhelmingly only dark mode :D

IMO quite nice marketing framework by sparktoro on how to figure out, where and how you should talk to your potential audience/customers

JS library to move external scripts into a webworker to increase web performance

Noice little guide on how to debug errors with your SSL certs

A subdomain discovery tool that returns valid subdomains for websites, using passive online sources. New learning for me: It is hard to find subdomains, you are not able to get them via DNS

Open-source tailscale configuration system. Somewhat like Tailscale but FOSS

Articles on how to get your SaaS ready for Enterprise users

There is something called server sent events (did not know about it) in the HTTP standard. Allows you to send events from your server to your frontend via a long-lived http connection. Quite nice to build hacky two-way communication. Article goes into detail how it compares to Web Sockets

Visual adaption of a Seneca letter. Stoic ideas about the pleasure trap

Golang middleware to check and validate JWTs in the request and add the valid token contents to the request context.

Tool to find memory leaks in JavaScript web apps

Static security linter for terraform

This video made me understand how you can detect and fix bit-flip errors in electrical engineering with Hamming codes. Great teacher.

Golang library to create desktop notifications on whatever OS you are on

Neat tool to online stream sqlite database to any S3 kinda storage. Allows you to build your entire infra on sqlite, with capping one downside of it

Monitor & detect crashes in your Kubernetes(K8s) cluster. Nice little tool, that I am actually a maintainer of

Great youtube video + article on how rocket engines get cooled

A beautifully illustrated article about how GPS works. If you want't to understand how your smartphone knows where you are, you HAVE to read this.

THE workshop if you want to write high-performance golang code. It is free and by the great Dave Cheney

Nice read on how to properly shut down go http servers in k8s

Googles GitHub orgs with all lot. A LOT of great tools for working with containers

GoLang package to compute the distance between two geographic latitude, longitude coordinates

Free (CC-BY) html website templates

Do keyword analysis directly in your google search results page

Amazing learning series by google about machine learning concepts. High-level, but great to get started

Go-based recommendation system

What an internet gem. A page where you see youtube videos of cars driving and the according web radio to it. Super relaxing (at least for me)

Tool for creating questions

A friction hitch is a kind of knot used to attach one rope to another in a way that is easily adjusted.

Generate perfect CSS code for all your font families

Great article on different tricks PostgreSQL has up its sleeve that you might not know about. My favorite: Column specify permissions

Tool to get recommendations on what indexes to configure in postgres in order to have more efficient queries

API service for webscraping. Offers headless browsers and rotating proxies to not get you blocked

Community for exchange around the topic of web scraping

GitHub Readme (apparently blogs are not cool anymore) explaining several different techniques on how to avoid being blocked by scraping protection

API documentation generator tool. Nice looking multi row design

Article about how a hostname regex looks. Guess what, a lot more complicated that you would think

[German] German ebay for confiscated good. Buy what police did seize.

Explaining how to spawn a new go process which can directly start taking new connections, so your API has zero downtime. Quite niche scenario, but two really interesting approaches to solve it.

Like I am not saying you need to know this, but it is damn interesting in-depth guide on how this woman did organize her sex work. Found this on my "to read" list, no clue where I picked that one up. (HackerNews maybe?)

Really nice visual explanation on how neural nets work

Quite nice read on how you as a dev can play around with BGP

Binary JSON Spec. Used by MongoDB. Kinda neat as it has super little spec surface and you can implement it yourself.

Tool to find expired Domains With Great Backlinks

Quite nice read about different rate-limiting algorithms

Port scanner with own network stack in order to scan entire internet in <10 minutes

Website which sells nutrition information. As their business model does not depend on ads, this can be more trusted than other sites on the internet

Tool to automatically downscale k8s deployments, e.g. during weekends or outside of working hours

(Paid) tool to monitor online communities for your keywords. Nice to reply to customer questions all around the web

Free weather API to build your own apps build on top of weather data

OWASP rule set to automatically configure your WAF

Thanos like long-term storage for prometheus

Kilo is a multi-cloud network overlay built on WireGuard

Library to read pst (Outlook email folder) files

Site for selling and buying internet businesses

Python library to create beatiful artsy maps for any address globaly via Open Street Maps

Convert images on the fly

Service to buy personalized videos made by your favorite actors. Nice presents.

Great to figure out on what platform to build your next plugin

Learn how to propperly set canonicals on your page

Domain registry

Keyword research on the go

Chrome Extension for Content and Keyword Research

Open source fonts

Go playground with autocompletion

HTTPS man-in-the-middle proxy

Ebook about networks. Has nice illustrations

JS lib for music apps in the browser

BGP implemented in golang

Tool to learn morse code online

GPT-3 supported copy writing tool

App that parses hacker news for book recommendations

Awesome Slideshare about how to grow the team in your startup

Go security static checker that aims to be better than gosec

Generator for Schema.org tags to get into Google search snippets

Allow to deep link into any text highlight on your site. Quite nice for text heavy blogs

Cross-plattform text expander. Makes all your typing faster. With emoji support

Landing page roasting service for 50$

Personality check by Ray Dalio

Email adress spider for website. Find email adresses for websites to contact

(Expensive) tool for col emails and outreach

Wine for mac osx apps

Intercept any risky patterns (default or defined by you) and prompt you a small challenge for double verification

Website to find good places to cowork all around the (western) globe

Market place for selling your software startup

Nice read about what to avoid during architecting your go webapp

Web scarping framwork

Free Tool to find Keywords using Google Autocomplete

A list of cold email templates based on real users data and expertise

A collective of researching working on Open AI tech

A short blogpost about bfftrace a linux tracer for analyzing performance of running software

Automatic detection and silencing of high cardinality series in Prometheus as k8s sidecar

Nice read about how to contain your prometheus and what to do if it is overwhelmed and chrashing

Blogpost on how to code your own k8s operator

Youtube introdcution to the fzf fuzzy command line finder

Learn from the most paranoid

Nice writeup about different ways to find your next SaaS idea

Prometheus compatible monitoring stack

Illustrations for project in absurd style

Record your HTTP interactions and replaying them in future runs

Blogpost on how to build a fulltext search engine in go

Blog post series on how to handle responsive images on your site

Blog post by Edward Snowden about the systematical problem of the cyber "security" sector

Deduplicating backup solution. I prefer borg, though

Find out what people are asking around a certain topic. Nice for writing niche SEO content

API test client (postman alternative)

Audience research tool

Jsonnet lib for grafana dashboards

Kubernetes operator that simplifies the managments of role bindings

Extensive post series about the starting phase in several market place businesses

Free hotjar alternative. Website heatmap tool

Self-hosted uptime monitor

Automated testing of your webapp on multiple devices and browsers

Test automation framework for web and mobile apps

Tool for user feedback

Search engine for CC0 images

Open Source Video Chat solution

Recommendation system

Automatic https for all go programs via Let's Encrypt

HTML sanitizer

Handy commands to run in Go projects

REST, SOAP, GraphQL & GRPC GUI

Analyse the dependecies of your projects for healthyness

Free SEO course

Check how much you spend in different places around the globe

Reload Deployment on Configmap/Secret change

Detect the language of a text

Visual editor for k8s network policies

Device mockup generator

Chaos engineering platform

Kubernetes Failure Stories

Record and replay your HTTP interactions

Create SLOs for prometheus

Kubernetes desktop client

OSINT tool to get emails, names, subdomains

Guide on how to start your own ISP (in the US)

API for getting daily updated live data data from google chrome UX reporting

Web crawling and web scraping framework

Thread safe connection pool for net.Conn interface

Illustrations library (paid)

Illustration marketplace

Design resources (payed)

Content aware image resizing

Open Source Airtable Alternative

Fast internet by loading from cloudflares caches

Website performance checker

A web developer tool that checks web applications for accessibility issues

Demoscene is a quite weird but awesome digital art form. This guide teaches you how to get started with it

Get back the old godocs in case you (like me) hate pkg.go.dev

Nice blogpost about how to optimize network code on Linux

CSS only masonry layout with using flexbox

Create nice images of your sourcecode. Great for social media

Go implementation of Bloom filters

Article about common errors in landingpages

Site showcasing mobile UX trends

Easily create links which automatically share on Facebook or Twitter

Natural language detection library for Rust.

Design book by the creators of TailwindCSS

Immutable database

Stream replication for SQLite, this is a game changer for how I develop my products

How to run a Go application with litestream in one Docker container

Nice blogpost about someone used litestream for his LogPaste tool

Ranking of world visa programs

Get the last version of a page cached by google bot

Ensure consistent column layout

An engineer giving insights how she handled the path into management

A binary encoding optimised for transmitting data through Twitter

Growth & UX case studies in a comic book format

Store wikipedia offline

A high performance memory-bound Go cache

Play games to stay sharp and engaged as DevOps team

Awesome article series about the tech involved in the moon landing

Netflix presenting its core company values

Website to find apps with bad ratings in various app stores. Nice start for a niche research for you next idea

Online tool for creating sequence diagrams

Kubernetes annotioantions convention to make working with services easier

Lib for spawning a goroutine pool

Highly configurable static analysis tool

Blog post about how much characters you should use per line to have a good readable site

Open source calendly alternative

Slides why you should choose boring technology

Website with scientific coding challenges to train

High performance framework used in scylladb

A specification for adding human and machine readable meaning to commit messages

An open source game about learning Git!

Streaming backup system for SQLite

Awesome library do build chat like looking forms

Faster json en/decoder compatible with encoding/json

Interactive maps in the browser based on vector files and WebGL

Linux (wayland) screenshot tool

Hierarchical note taking

Open source kanban board

Buenos Aires digital nomad program

Find vulnerable regex expressions

HA PostreSQL cluster on docker

Wave synth

Linux DAW

Youtube channel teaching about music production with open source software

Automatically set GOMAXPROCS to match Linux container CPU quota

A private network system that uses WireGuard under the hood

List of nice resources for SREs

Get started in the SRE methodology

Book about building SaaS

Open Yale Course about game theory

Scan websites for viruses

Simple yet flexible JavaScript charting for designers & developers

Social Bookmarking tool

: Track any webpage for change. I mainly use this for release pages if I wait for a new version. (Also works on github)

Cross platform gRPC client

Tool to get notified when someone mentions your brand

Simple tool to check crontab schedule. I use that like a few times a week

Generate type-safe go code from sql. Never ever write database layers again :)

Toolsuite to inspect your websites security

Investigate wireless protocols with your SDR

Online learning games to sharpen your frontend skills e.g. flexbox zombies teaches flexbox skills

Free software useful for developers

AI generated human faces you can use for cheap in your projects

A Node.js command line tool that crawls a domain and compiles a report with lighthouse performance data for every page.

Nice channel about the cryptographical basis of crypto currencies

Inspect your postgres with a top like interface

Open Source static analytics tool with integrations for github, gitlab, etc.

A curated collection of publicly available resources on how technology and tech-savvy organizations around the world practice Site Reliability Engineering (SRE)

A list of common kubectl commands

: Clean up Kuberntes yaml and json output to make it readable

Kubernetes Failure Stories

Key/value store written in golang

Continuous profiling for go programs

Free stanford online course on how to develop in SwiftUI

Check how much time your go programm spends waiting on blocking operations (e.g. channel sends)

Free ebook by Jeff Erickson on different useful algorithms

Read any github repo in an online vs code interface. I like it better than original github

Introduction into useful knowledge for SREs

This ebook walks you through the steps of a salary negotiation process

Avatar vector generator

Sync data from one Postgres database to another

Build cross platform native apps in vue

Unix command line queue utility

Open source survey system

Backup software

Shell prompt

Fonts with all the nice addons for coders

Open source kanban board

Open source status page service

Google tool for website optimization

Performance checker

The open-source self-hosted web archive.

Check basic accessibility metrics

Visualize the requests on your site

How you can generate images with golang

golang implementation of Swagger 2.0

Check what backlinks your site has

Test if your site works good on mobile

An utility to write tests against structured configuration data (e.g. k8s yamls)

Trade bitcoins person-to-person in an easy, fast, and secure way.

Web accessability evaluation tool

Awesome articles pinterest shares

Open source automation software

Local filesharing via webRTC

Check website for privacy violations

Check website for privacy violations

Create alerts for your keyword/product being mentioned on the web

Kong is a command-line parser for Go

: Feature flag system

: A font with greater legibility and readability for low vision readers

Free courses about different data science topics

Enough work for today Here some random internet to distract you ;)

Design better user flows by learning from proven products

Stripe payment recovery

Static code analyser

Live ML anywhere

ool for deflickering image sequences

general purpose task queueing system for Go programs

k-means clustering algorithm

charts library for Golang

periodically kills random pods in your Kubernetes cluster

All the cloud native projects in a graphic

An open source serveo/ngrok alternative.

Roaring bitmaps are compressed bitmaps. They can be hundreds of times faster.

Domain keyword finder

SeaweedFS is a distributed object store and file system to store and serve billions of files fast!

Online map to walk around and talk to your coworkers

Only spacial voice chat. You can walk around and when you get close to groups you hear them louder

Cloud Native k8s chaos framework

Falsehood programmer believes

Headless chrome running in docker

Open source firebase alternative running on postgres

Remove image metadata online

A font specially designed for good readability, even for visual impared users

Feature flag system

Load balancer

Kubernetes CLI To Manage Your Clusters In Style!

My favorite uptime monitor. Super cheap and notifies via Telegram as well

sudo_pair is a plugin for sudo that requires another human to approve and monitor privileged sudo sessions

Package to simulate bandwidth, latency and packet loss

Free CC licensed music

A youtube course by the MIT teaching all about programmer tooling

A typeface designed to mimic the national park service signs

Run Android applications on any GNU/Linux operating system

Faster string functions for go

big head avatar library (also react lib available)

List how to opt-out from several internet data brokers

Create graphics with a hand-drawn, sketchy, appearance

Notes on working with Go and computer systems

Design tools for developers

Noice supression for the microphone

I am subscibed to a bunch of newsletters in this nice list

Useful template functions for Go templates

Markdown to slidehshow

Changing and overlapping them, you can quickly illustrate an idea of your startup

an illustration library of people and objects

Hand-drawn free vector illustration resources