Werewolf gets played pretty often, so The Resistance should be a welcome change that won't be too unfamiliar. Two Rooms and a Boom could also fit the bill.
I have a few board games, but wasn't really planning to bring any. Most of them are pretty robust and I figured people wouldn't want to give up too much LAN time to learn rules and play a few games. Get Bit and The Resistance would work well though, since they're explained in a couple of sentences.