travtrack is a tool to help a Traveller(tm) referee keep track of essential data for a game. Already implemented are galaxies, sectors, subsectors, systems, stars, planets, belt and moons. Yet to be implemented are trade routes, ships, characters, and all the rest. These will take some time, but should not be too complex. It currently uses the GURPS Traveller:First In rules for system generation, but a subproject is under way to add Classic Traveller generation and output. travlib is a collection of C routines that should make writing a Traveller application easier. A guile interface to the data representation functions is provided.
Babelize is a collection of localizations for Linux games. It currently features French, German, Polish, and Spanish translations for "Heroes of Might and Magic III", as well as French, German, and Spanish translations for "Alpha Centauri - Alien Crossfire". The goal of the project is to provide localizations for as many native Linux games as possible.
Sphere is a RPGCE (a role-playing game (RPG) creation engine) that allows you to relatively easily put together an RPG along the lines of Final Fantasy 6 or Phantasy Star. It supports 32-bit graphics (with 256 levels of translucency) and MP3, Ogg, MOD, S3M, IT, and XM files for audio (and WAV and SPX (speex) for sound effects), and does not place arbitrary limits on map, tile set, sprite set, or script sizes.