GitHub Visualizer - Enter user/repo and see the project visually
Traq - Traq is a PHP powered project manager and issue tracker featuring multiple projects, milestones...
Learn X in Y minutes - LearnXinYminutes isn’t a good way to learn your first programming language, but it’s a great way to...
Bugify - Bugify is a simple PHP issue tracker, designed to offer powerful bug tracking capabilities in an easy to use system.
Gource - Gource is a software version control visualization tool.
jtrac - JTrac is an open source and highly customizable issue-tracking web-application written in Java.