The "Virtual Universe" is a realistic, three-dimensional cyberspace and virtual reality simulation. People can meet, interact with each other, build houses and whole worlds, simulate workflows, test designs, and much more. Due to its extensive programming interface, this virtual reality environment can be used for scientific and engineering tasks such as simulation and visualization applications. It also includes a terrain generator for virtual landscapes and the Java XTools, an extensive package that contains several enhancements and improvements for Java3D and Swing.
dopewars is a UNIX rewrite of the MS-DOS program of the same name, which in turn was inspired by John E. Dell's "Drug Wars" game. You have one month to buy and sell drugs on the streets of New York, the aim being first to pay off your debt to the loan shark and then to make a fortune. And if you have to shoot a few cops in the process, well... The game includes TCP networking allowing you to meet (and shoot) other human drug dealers. Computer drug dealers are currently in development.
The Noble Ape Simulation is a collection of a number of autonomous simulation components including a landscape simulation, biological simulation, weather simulation, sentient creature (Noble Ape) simulation, and a simple intelligent-agent scripting language (ApeScript). Noble Ape also contains a social simulation where the Noble Apes can be tracked in terms of social groups and also over many generations to explain social phenomenon to users looking to study this kind of interaction. It has been in development for more than a fifteen years.
Lincity is an SVGALIB (Linux only) and X based city/country simulation game for Linux and other Unix platforms (Solaris, FreeBSD, HP_UX, AIX, SCO and IRIX). There is also a Win32 version (win95 and NT) available as a separate package. The game reminds a bit of SimCity but has it's own goals and methods to get there.