Downloading JediKnight 2.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The software lies within Communication Tools, more precisely Texting & Video calls. We recommend checking the downloaded files with any free antivirus.
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 Skype2Prowl, which might be related to JediKnight.