Keyword Tool
Keyword Tool leverages Google Autocomplete to generate long-tail keyword suggestions. It's a valuable free alternative to Google Keyword Planner, especially for content creation and SEO, providing up to 750 suggestions per query.
Keyword research entries
AnswerThePublic
AnswerThePublic is an invaluable tool for finding out what questions people are asking around a specific topic. I find it excellent for generating niche SEO content ideas and understanding user intent for keyword research.
Ubersuggest
Ubersuggest is primarily a domain keyword finder that also offers a suite of AI-powered SEO tools for competitive analysis, site audits, and rank tracking. I find it a decent entry-level option for quick insights.