Timeline - Timeline is a cross-platform application for displaying and navigating events on a timeline.
GitKraken - The intuitive, fast, and beautiful cross-platform Git client.
Sutori - Sutori is the easiest way to create an interactive story collaboratively.
SmartGit - SmartGit is a front-end for the distributed version control system Git and runs on Windows, Mac OS...
Aeon Timeline - "The timeline tool for creative thinking. Capture, create and explore ideas."
SourceTree - Mac and Windows client for Mercurial and Git.