BZFlag is a 3D, multiplayer, tank battle zone, capture the flag game that pits players against each other in a networked environment. It runs on Windows 95/98/NT/2000, Linux, MacOS 10.x, Irix, Solaris, and others. An OpenGL accelerator is highly recommended, but it is playable with 3D in software.
infobot is an IRC bot written in Perl 5 which implements a sort of artificial intelligence by learning information ("factoids") from channel discussions and then responding intelligently to queries about this accumulated information. It also acts as a gateway to other useful sources of information (e.g. online dictionarys/weather stations, internic WHOIS database, DNS, IMDB, slashdot headlines, search engines, other infobots).