GitPrep : GitPrep is Github clone. you can install portable github system into unix/linux. You can create users and repositories without limitation.
iPlotz : Wireframing, mockups and prototyping for websites and applications
Arora : Arora is a lightweight cross-platform web browser. It's free (as in free speech and free beer). Arora runs on Linux, embedded Linux, FreeBSD, Mac OS X...
Weblate is a free web-based translation tool with tight Git integration. It features simple and clean user interface, propagation of translations across subprojects, quality checks and automatic linking to source files.