GAIM is a great instant messenger program in linux.
Many years ago when this project was first started, it was called “GTK+ AOL Instant Messenger.” AOL naturally complained, and Mark Spencer changed the name to “Gaim.” AOL was appeased, and no one really ever heard of it because there were very few users back then.
A few years later AOL trademarked “AIM,” and started referring to their IM services using that name. They complained. The issue was brought up on Slashdot, and the Gaim developers at the time got some legal support. That legal support advised that the ongoing discussions with AOL be kept confidential until fully settled, and so it remained. The public thought the issue had gone away then. It sorta did, in that AOL stopped responding to Gaim’s legal support for a while.