"A fantasy d20-themed dungeon crawler", to quote DarkGod's comment. Inspired by Incursion by Julian Mensch. Made available under Open Game License. This is a non-profit fan project. No money is made. There are currently only two people working on the mod. However, we have released several beta versions so far.
Judging by the debug logging, the humanoid AI can now swap between ranged and melee weapons, to use the stuff they picked up, for example.