Trumpeter is a stand-alone server that integrates RT (Request Tracker) with an XMPP chat server (used by Jabber, Pidgin, Google Talk, etc.). It regularly queries RT, and posts notification messages in chat rooms when new tickets arrive, when they are about to expire, and when they are past their due time. It is quite configurable, making it easy to watch several RT queues simultaneously and post the results to different chat rooms.
GZRBOT is a port of GOZERBOT to the Google Application Engine. It is there for its code and reuse of it is highly recommended. A script is available to clone gzrbot and rename it so you can run your own bot off the GZRBOT code. GZRBOT has a plugin system that lets you program your own plugin and provide you a way to add custom functionality to your bot. Both writing commands and reacting on events through callbacks is supported.