On one of my many strolls through the internet, I came by a newspost on the irssi website. irssi is a small, terminal based IRC client. It’s quite popular and has enough options to satisfy your customization needs. Apparently there is a irssi “c0ders” theme that looks just like Eclipse, so you can use it at work without your boss or co-workers knowing that you are chatting in stead of working. Offcourse this was not the intention of the creator of this theme