"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.
All characters now start with a random potion and a potion of cure light wounds. This one has won the jackpot - the random turned out to be heal light wounds!