what, unofficial ones?
www.teambg.net . except its down right now (grr)
or if you want locations of ones in game. well, thats a bit tougher. you can usually get one on this very forum (go to search aand type in the weapon name).
www.gamespot.com s walkthrough gives area codes for both BG1 and BG2 weapons, but the BG2 site sucks. it dosent have a contents page!