Stack Overflow - Community-based Q&A part of the Stack Exchange platform.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
SourceTree - Mac and Windows client for Mercurial and Git.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.