Finch is a package dependency graph management engine with interfaces in many programming languages (C, Obj-C, Perl, etc). The goal for this project is to provide a robust replacement for the current dependency engine in Fink (fink.sourceforge.net)
The Mac TeX Toolbox provides an umbrella for TeX related development for Mac OS X: discussions, pointers to libraries and other support for open source TeX development on Mac OS X.
The Open Descent Foundation (ODF) is a community for developers, who want to help to create open source programs, tools, etc. for the famous games Descent1, -2 or -3. Everyone can join the ODF if he accepts the idea of writing open source programs.
OpenLyrics is a project to provide a free, open source database, software, and various access methods (such as SOAP) for integrating song lyrics into music applications.
PicaSto is a system for decentralized picture storage and sharing on the internet with separation of content and presentation. It uses the RDF metadata model to make the metadata available independently of the actual pictures.
SMBconfX provides a user-friendly front end for advanced configuration of the native SaMBa-Server of Mac OS X. This way, file sharing in mixed network enviroments is simplified.
The Gnuritas project aims at designing a "smart" and flexible framework and tools to manage and share knowledge, information and scientific data.
ZDE, or Zeta Desktop Environment, is an attempt to create a new X11 window manager & tools based on enhancing usability and features for advanced users & developers.
Toten is an RPG game engine/platform that enables many types of RPGs to be created.