KaGez-Production aims to make game developing under Linux easier. Tutorials and examples, reaching from simple console applications (non- graphical) to OpenGL games, are available, as well as tools like Image-Viewers, and 3D-Model viewers. All applications will be made for Linux only, most graphical items will work with GTK+/GNOME.
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.
vetetris is a game written in Java. It's similar to tetris, but it is played in 3D. There are figures which are falling that have to be placed in the right manner. You can rotate the blocks in six different directions and move them in five directions. As time goes on they move faster and faster, and it gets harder to put them in the right spot.