Control iTunes remotely via a web browser or a client-side program.
mytunes - A sweet mp3 (and later other formats) player, made to be used in a GNUstep, or other OpenStep/NeXTSTEP/Cocoa-like environments. Offers wonderous playlist support, including superlists, which are similar to smart lists.
omtk is a platform independent GUI toolkit for multi-document applications. It runs currently natively on GTK2 and Mac OS X. Support for OpenGL and a Win32 port is planned.
An Open Source Render compatible with the RenderMan Interface (currently version 3.2) from Pixar and highly expandable, with addition of geometric plug-ins, hidder plug-ins, output device plug-ins, and Shading Language extension plug-ins.
Binary package of Ximian (Novell) Evolution (X11 version) for Mac OS X, with native Mac OS X installer.