IDLE is an Integrated Development Environment for Python (v3.5). IDLE is written using Tkinter and therefore quite platform-independent.

Bygfoot allows you to manage a team by training the players, buying and selling them, contracting loans, maintaining the stadium, etc. You can be promoted or relegated, even become a champion if you're a skillful manager. You can customise Bygfoot by writing your own country definition files or by creating your own team definition files.

Do'SSi Zo'la is an SDL implementation of the Isola board game, featuring nice animations, which makes it appealing to children.

Titanion is an abstract shooter game. While you fire with one button, the other one acts as a tractor ray to attract the enemies and take them to the combat line. The game in itself is quite simple, but with such graphics and playability that it's worth a try.

GWorkspace is the official GNUstep workspace manager. It is a clone of NeXT's workspace manager. GWorkspace is probably one of the most useful and usable workspace managers available on any platform, owing to its well-designed interface and the natural, consistent design that it inherits from the GNUstep framework.