GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
openDesktop.org - The website openDesktop.
SourceTree - Mac and Windows client for Mercurial and Git.
SourceForge - The Complete Open-Source and Business Software Platform.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.
Eclipse - Eclipse is an open source community, whose projects are focused on building an open development platform comprised of extensible frameworks, tools and runtimes for building, deploying and managing software across the lifecycle.