anairc: not an IRC chat
Anairc uses broadcast UDP packets to comunicate on the local network so all the clients can talk to each other without a central server, just start it and talk!
If you worry about the "broadcast" thing, then don't worry, Windows machines broadcast a lot of crap all the time, it won't make a difference.
Unfortunately when this was written I didn't know python so it's written in Java.
Just run
$ make
$ make start
To compile and execute.
If you happen to not have make installed shame on you! Open the Makefile and figure it out by yourself.