Free developer tools

This page collects free tools in the Developer Tools category. The three here cover different jobs, from database tuning to model access to tool discovery.

Culprit SQL Studio is open source under the MIT license and has no paid plans. It reads the statistics that SQL Server, PostgreSQL, MySQL and MariaDB already keep, then explains slow queries, index gaps and lock problems. UnoRouter is freemium. It offers free models with rate limits and no card, and paid models run on prepaid credit. TrendingDevTools is a free directory where makers submit dev tools, AI tools and SaaS products at no cost.