OpenVerse is similar to other graphical chat systems like Excite Chat and Microsoft Chat, with the main differences being that OpenVerse is open source software, has no advertisements, and also runs on a variety of systems including Windows, Unix, Macintosh, and just about anything else for which you can find a copy of TCL/TK.
Tkinter is Python's de facto standard GUI (Graphical User Interface) package. It is a thin object-oriented layer on top of Tcl/Tk. To use Tkinter, you don't need to write Tcl code, but you will need to consult the Tk documentation and occasionally the Tcl documentation (since Tk's low-level event handling mechanism is considered part of Tcl).
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.
Phpcron is a PHP command line program, which allows you to execute programs and system commands at certain scheduled times. It operates in a similar fashion to Unix's Crond daemon, and can be used in place of, or as a complement to crond. It allows a host of options, including logging, and email features. The Phpcron package includes Phpcron Admin, which provides a browser based interface to Phpcron, allowing a user to remotely schedule programs and change Phpcron options, without having to deal with SSH, telnet, or arcane text editors.
EvoChess is a scientific experiment that uses Internet-connected computers in the evolution of chess playing programs. You can participate by running qoopy, an environment for distributed computing as done by EvoChess. The users can start their own evolution to develop a variety of chess programs. The better ones will survive and produce offspring, who inherit their successful behavior encoded in their genotype. To run it, Java 1.3 must be installed.
Astro Battle is an online multiplayer space simulation game where players can design and pilot their space ships against each other. The spaceships are made up of modules. Modules are components that contribute some ability or property to the spaceship as a whole. Some examples of modules are bridges, thrusters, cannons, torpedo bays, reactors, and batteries. A Player can join an arena by challenging another player to a space duel or by joining a dedicated server (which can host several players at a time). Astro Battle also has a practice arena for testing ship designs offline.