Arx Libertatis is a cross-platform, open source port of Arx Fatalis, a 2002 first-person role-playing game developed by Arkane Studios. Arx Fatalis features crafting, melee and ranged combat, and a unique casting system where the player draws runes in real time to effect the desired spell. The Arx Libertatis source code is based on the publicly released Arx Fatalis sources. This does however not include the game data, so you need to obtain a copy of the original Arx Fatalis or its demo.
Avadan is a role-playing game situated in space. The player travels from planet to planet in order to find the mystical oracles. The player is placed in nethack-style dungeons. The whole game is rogue-like, but with the extension of space travels. The dungeons are shown with tile graphics, and space looks a bit better. On space stations, the player can talk to NPCs, get quests, and trade artifacts found in the dungeons.
AweMUD is a MUD server for use with fantasy-settings. Features include fully dynamic objects and characters, an advanced scripting system, and custom worlds. The engine will eventually have completely interactive rooms (items can be placed under benches, doors can be destroyed), complex magick, and interactive NPCs.