BitchX is the premiere IRC (Internet Relay Chat) client. It originally was a modified version of the popular ircII client, and the features were eventually merged into the EPIC IRC client. The current development is aimed at merging the client back to a current branch of EPIC and bringing compatibility and stability back to the client, while bringing the features that are BitchX into a new client.
MultiChat is a chat client with the major focus on one-to-many communications (chat rooms and others). It does not aim to be a multi-protocol client. Instead, it seeks to provide multiple chat and collaboration resources based on integrated development with a single protocol and server software.