wmsystray provides a system tray compatible with freedesktop.org's System Tray Protocol specification. Basically, it serves as a system tray that allows other programs to show icons in it. For example, if you enable GAIM's System Tray Icon plugin, wmsystray will display GAIM's systray icon. Its intended use is as a Window Maker dock app, though it will run in other window managers as well.
GNUSTEP Live CD contains a lot of software for GNUstep, a free implementation of the OPENSTEP framework (which is also directly used in Mac OS X as Cocoa). It includes excellent applications for RAD (GORM and ProjectCenter). The CD is available for i486, AMD64, Apple Mac PowerPC, and Sun UltraSPARC computers.