Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Deck - A multi-timeline viewer for GitHub repository events
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
ChronoFlo Timeline Maker - Create beautiful interactive timelines that you can share online
Board for Github - A webview based GitHub project app with native features
Time.Graphics - Time.Graphics is a timeline and free of charge online service for creating infographics.