"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.
This is the second level of the thieves guild. The top level resembles any other building, but the lower level is a veritable maze full of traps. Fortunately, these are but the simplest ones. Unluckily for us, the test character is NOT a rogue :)
P.S. The trap is under the beer.