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.
LifeSaver is a Mac OS X screensaver that simulates Conway's game of life on screen. The starting configurations for the cells are randomly selected from predetermined configurations and from randomly generated configurations. MandelSaver is a Mac OS X screensaver that draws colorised Mandelbrot images on the screen. The position and coloration of the subset of the fractal displayed is randomly selected.