The givetake package provides two small programs, give and take. These two small programs enable your users to give or take files to or from other users. PAM is used to know whether the user should be able to give or take another user's file(s). This means that you can use whatever authentication method you want.
The XMMS Picture Viewer Input Plugin adds picture support to XMMS for various image formats. The picture is displayed for a (configurable) time. In conjunction with XMMS playlists, this makes it possible to create slideshows very easily, e.g. opening a directory that contains picture files directly starts the slideshow.
Shark Enterprise Community Platform is software for those who want to earn money with their community sites. Shark contains necessary tools for successful business management, such as an income calculator which can provide you with data on your incomes, expenses, and their ratios. It also includes features useful for Internet marketing.
Agendaroids is a game where you maneuver a space ship in a field of asteroids, and shoot at them to break them into smaller pieces. It uses vector-based graphics with fixed-point trigonometry, so it runs well even on the FPU-less VR3, but it also runs on any other Xlib-based system.