Lachesis is an IRCRPG combat engine written in a combination of C and C++. The combat engine is being written for a specific RPG, but most of the project should be useful to IRCRPGs in general. It includes a native interface to the IRC protocol to allow it to act as an IRC bot, for such uses as dice rolling and acting as a remote-controlled client (RPG NPC perhaps).
Lycanobot is an IRC bot used to play the game, "The Werewolves of Thiercelieux" (Les Loups-Garous de Thiercelieux), which is quite like Mafia, the traditional Russian party game. It aims to do everything a game master has to, including distributing cards, asking things in private, announcing kills, etc.