In addition to the 10 original Doom64 weapons, Unabsolved features at least 4 new weapons: the railgun, the nailgun, the flamethrower, and the Force-a-Nature. There are also 3 "sidearms" implemented so far which are used with the altfire key, the Uzi, the taser, and the healing staff.
http://zandronum.com/forum/showthread.php?tid=6327