TileMill : TileMill is an application for making beautiful maps
Tiki Groupware/CMS : Tiki Wiki CMS Groupware is a free and open source Wiki-based content management system and online office suite written primarily in PHP and distribute...
FreeMind : FreeMind is a premier free mind-mapping software written in Java.
Buildbot : Buildbot is an open-source framework for automating software build, test, and release processes.
iPlotz : Wireframing, mockups and prototyping for websites and applications
Diffuse is a small and simple text merge tool written in Python. With Diffuse, you can easily merge, edit, and review changes to your code.