Free research tools

Three free tools sit in the Research category, and they serve quite different needs. Two focus on AI, and one is for puzzle players.

aifeed.dev is a community-run feed of AI, machine learning and LLM news. Members submit and vote on links, and the feed updates daily. Reading is free, though submissions are reviewed or cost $5. Zoipi is a curated directory of AI tools with filters for category, pricing and foundation model. It also lists MCP servers. SonglessAnswers is a fan-made site with daily Songless answers and progressive hints.