Stratagus is a cross-platform real-time strategy gaming engine. It includes support for playing over the Internet/LAN or playing a computer opponent. The engine is configurable and can be used to create games with a wide range of features specific to your needs. Some games based upon it include Battle of Survival, Wargus, and Battle for Mandicor.
Tux Paint is a simple and entertaining drawing program geared towards young children. It has a simple interface, sound effects, and a cartoon character (Tux, the Linux penguin). Along with drawing brush strokes, lines and shapes, you can also enter text and place "rubber stamp" (or "sticker") images on the picture. Tux Paint is extensible, and could be useful in an educational environment (such as a grammar, elementary, or grade school). It's portable across numerous platforms, and runs well even on slower systems like the Pentium 133MHz.
Tux Strikes Back is a level set (new world) for SuperTux 0.1.3, the popular open source jump'n run game which is available for many different platforms. This set comes with 18 new levels and its own world map and story. An installation of SuperTux 0.1.3 (Milestone 1) is required.
"Tux, of Math Command" is an educational math tutorial game for elementary school level children. Like so many other Linux games, it stars Tux, the Linux Penguin. Players must answer math equations to shoot down comets which are falling towards their cities. It can run on Linux/UNIX, Win32, Mac, and BeOS.
UnZip will list, test, or extract files from a ZIP archive, commonly found on DOS and Windows systems. A companion program, Zip, creates ZIP archives; both are part of the Info-ZIP project. Both programs are compatible with archives created by PKWARE's PKZIP or Nico Mak's WinZip, but in many cases the program options or default behaviors differ.
Ved (visual editor) is a small and very fast screen-oriented text editor that implements a user interface somewhere between vi and Emacs. It is powerful and easy to learn, and has no limitations on line length, file size, or the types of characters that may appear in a file. It is a highly portable editor for Unix and most other OSes.