Waydev - Waydev analyzes your codebase from Github, Gitlab, Azure DevOps & Bitbucket to help you bring out the best in your engineers work.
Cheat Sheets Dev - Community built to share popular programming snippets.
Git History - Quickly browse the history of any GitHub file Replace github.com with github.githistory.xyz in any file url.
GitSpo - Measure & engage your open-source community
Git analytics - for software developers, teams, and open-source communities
Ruby Toolbox - Explore and compare open source Ruby libraries