WizIQ is a unique live video, text chat, and whiteboard tool that is absolutely free to use. It also includes a neat feature that Elluminate doesn’t have: a public document library.
Basically how it works is any member can teach or learn content online using the tool. You can build networks of learners and instructors, access and share content. You can send invites to all your webmail contacts (gmail, aol, yahoo, hotmail) and search for content by topic.
There is also a whole range of educational presentations and documents available. You can even share or get code to embed these presentations in your own site or blog.
Finally you can schedule sessions with other members using the calendar tool. All sessions are recorded and you can even engage in public sessions with content experts.