Penflip - Typewrite is a real-time collaborative writing environment with Markdown support, versioning and Dropbox syncing. Alternatives to Penflip for Web, Windows, Mac, Linux, iPhone and more.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Cleartext - A text editor that allows only the 1,000 most common words
SourceTree - Mac and Windows client for Mercurial and Git.
Quill - Powerful, API-driven rich text editor
GitHub Desktop - GitHub Desktop is a seamless way to contribute to projects on GitHub and GitHub Enterprise.