The Role Playing Database maintains data files containing information about the players, monsters, spells, treasures, tricks, traps, etc. used in table-top role playing games, such as Dungeons and Dragons. It also provides a way to make maps of the playing environment (e.g. dungeons) in which the game(s) take place.
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.