SmallDevTools - Handy developer tools with a delightful interface
Trending Duck - Get data driven trends of top physical/ecom products, weekly
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Code Climate for Google Chrome - Code quality and test coverage, directly in GitHub
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools
Request for maintainers - Find any OSS project calling for collaborators