Any good, free LAN games?

Question

I just set up a LAN in my home and am wondering if there are any good free games that can be played over a LAN. My PC is running Vista Ultimate 64-bit and my laptop XP Home 32-bit, so the game must be compatible with both O.S.s (this throws Doom 95 out of the picture - it doesn't seem to like the networking too much on my Vista computer.) Game name + location appreciated. Remember - freeware, not trials!

Answer 1

http://www.soldat.pl/index.html