General and simple IRC bot framework with very flexible bus architecture and plugins support, originally written for use as RPC gateway for remote message sending to multiple IRC channels or users. Now: http://github.com/martinkozak/pyircgate-daemon.
JIB - Java IM Bot, aimed to built a pluggable,
customizable, expandable and dynamic bot framework for
instant messager. With JIB user can control remote IM Bots over web based interface, configure bots to perform various tasks or custom behavior.