I was on a server yesterday, and it had 2 traitor weapons that were GREAT fun.
1st example, player bomb, you have to plant a bomb on a player's head, it takes about 4 seconds, so rather place it in the back, and make sure he/she isn't looking, it's impossible to see he/she has a bomb by ANYONE but the traitors.
If you select your bomb and rightclick, a red dot appears to everyone and it'll beep like a c4 and the person will explode and the body will be gone. [once got 2 detectives with one bomb with this.] XD
2nd weapon isn't that detailed, it's a blinder weapons, blinds you for 3 seconds if being shot with.