(will be updated if something changes)
126.96.36.199:26000 = Darkplaces server with Warpspasm. You must connect with Darkplaces (even though FTEQW supports the protocol, it is jittery and crashes on the later map at the time of writing). I know this sucks, especially since it makes playing anything but the start map impossible for me�
188.8.131.52:26001 = ZQuake server with Travail. ZQuake is recommended as client, any QW client should work though.
184.108.40.206:26002 = Good old nightmare Quake. QuakeWorld once again.
These will be gone again in ~2 weeks. Have fun!