Nexuiz GPL is a fun and free GPL deathmatch shooter released in 2005. It is a free game: source code is free software and data is free content.
Botmatch on reslimed. The bot uses the Fireball (another new weapon). The primary fires little fire mines which burn for some sec and ignites a player who take a constant damage for some sec. The secondary needs some time and much ammo to charge up and then its like the Redeemer. Very devastating!