Had an online conference today, and used Yugma for desktop sharing and collaboration. It’s the first time I’ve used it, but it’s an impressive tool, and completely free for the basic version.
It’s got desktop sharing with chat and annotation tools. There’s no VOIP functionality, so we used Skype instead. The combination worked well and was very effective.
There’s a [slightly] more complete review on CenterNetworks. If you’re looking for an online collaboration tool, this is worth checking out. I’ll definitely be using it again!