"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.
An old copy and paste error caused many functions not to work for the player - among them triggering an attack of opportunity when moving away. The error is now fixed (see those 'Dwarf makes an attack of opportunity' messages?)
In other news, the log has been improved. Many messages can now differentiate between the player and the NPC using color and the color for 'missing' in the log message is now more readable.