You could have downloaded JediKnight 2.1 for Mac from our application library for free. JediKnight for Mac is categorized as Communication Tools.
From the developer:
JediKnight is an IRC client for Mac OS X. Features include: Full Aqua interface compliance. Pervasive alpha-channel support. Multiple server connections. Asynchronous network operations. User-defined text commands.
You may want to check out more software for Mac, such as TRx Recorder or Skype2Prowl, which might be related to JediKnight.