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PennMUSH is a MUD server that is often used for running social or role-playing games, with an extensive internal programming language.
It runs on Unix systems, Windows, and MacOS.

License: free

The game is played on a 6x6 board divided into four 3x3 sub-boards. Taking turns, each player places a marble of their color (black or white) onto an unoccupied space on the board, and then rotates one of the sub-boards by 90 degrees either clockwise or counter-clockwise. A player wins by getting five of their marbles in a vertical, horizontal or diagonal row (either before or after the sub-board rotation in their move). If all 36 spaces on the board are occupied without a row of five being formed then the game is a draw.

The program includes an AI (Artificial Intelligence).

License: free

Pentagram is a game engine for running Ultima VIII on modern operating systems. Since a modified version of the Ultima VIII engine also powered the two Crusader games (Crusader: No Remorse and Crusader: No Regret) the team's ultimate goal is to be able to run those two as well. For those not familiar with the game: you are playing the role of the Avatar who already several times saved the worlds from evil forces in Ultima I-VII, but now you are thrown into the unknown world, which is already destroyed by those forces and you should explore it and find out the way to defeat the evil yet another time. On your way you will find many friends and foes including undead creatures, giant spiders and trolls, talk to local people and solve many mysteries and puzzles.

License: free

Additional System Requirements: Original files from Ultima VIII are required to play the game.

This is an implementation of the Asian strategy game ni-nuki, which is a version of go-moku. Players place stones on a grid, and the first person to either place five in a row, or capture five pairs of his opponent's stones, wins. Two humans can play at the same terminal, but not (yet) across a network.

License: free

Penumbra: Overture is a first person adventure game which focuses on story, immersion and puzzles. Instead of using violence to progress the player has to use his/her wits to guide Philip on his quest to unravel the past.

Played from a first person viewpoint, Penumbra is very different from other adventure games. Not only is it powered by a 3D engine utilising cutting edge technology, it also has an advanced physics system which allow for a never before seen environment interaction. The player can open drawers, pull levers, pick up objects and more using natural mouse movements creating a highly interactive and immersive game world.

The weapon system differs from your average game; swinging a melee weapon is done using the mouse which increases the realistic feel of combat. Fighting enemies is not something best done with brute force though, in most situations fighting is a last resort and the player is often better of using his/her wits. The AI of the enemies will also do its best to hunt and scare the player. The creatures encountered can break down doors, use group co-ordination, interact with the physics and more.

Penumbra: Overture will keep players on the edge as they have to explore scary and immersive environments never knowing what is behind the next corner. The world is detailed, graphical as well as a story wise making the player feel part of the world as secrets are uncovered.

License: commercial ($19.99)

Additional System Requirements:

Processor: 1Ghz Memory: 256MB Disc Space: 300MB free(for demo) 1GB for Full Version Video Card: Radeon 8500/GeForce 3 (GeForce4MX not supported)  Kernel 2.6 or higher(2.4 untested) glibc 2.3 X11R6 with 3D acceleration For x86_64 CPU, 32-bit environment must be installed  

Perlmoo is a server for a virtual world, a computer program which users can log into and explore. Each user takes control of a computerized persona / avatar / incarnation / character. You can walk around, chat with other people, solve puzzles, and even create your very own rooms, descriptions and items.

Perlmoo is intentionally similar to lambdamoo from the user's perspective, but it's written as object oriented perl code, that can easily be modified and expanded. It's possible to code new object in perl while the moo is running.

Perlmoo has been supersceded by its successor, mooix. Check out mooix's website for details about mooix.