openDesktop.org - The website openDesktop.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
SourceForge - The Complete Open-Source and Business Software Platform.
SourceTree - Mac and Windows client for Mercurial and Git.
Freecode - Freecode (formerly known as Freshmeat) is one of the legit open source development platforms that will be the key for developers and programmers to have a streamlined process via having enhanced collaboration and coding leverages.
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.