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.
AeonWave-OpenAL is a thin OpenAL emulation layer that uses AeonWave to create one of the fastest rendering OpenAL implementations available. OpenAL is a cross-platform 3D audio API appropriate for use with gaming applications and many other types of audio applications. Its API style and conventions deliberately resemble those of OpenGL.