Radius claims to be a “Social IM” tool – it allows you to know where your friends are, as well as integrating more than one IM accout. I’ve not yet tested it, so not sure if it works outside of the US. (Via: Profy)
Evo is a Java based tool, developed by CERN, and seems pretty powerful. From the information on the site, it seems like a rival to FlashMeeting – and possibly do more. When I installed it, though, it found a firewall in the way (not surprised about that) and then hung. So, more investigating needed I think.