There are a couple free online meeting solutions, such as Zoho and WiZiQ.  Of course these are just trials but at least you get to try their online meetings and or online classrooms.  When you’re looking for online meeting software you might as well use a trial, a free trial, it does or does not work. 

The free online classrooms use a whiteboard application. Users in a session see what the teacher in the session is demonstrating. It is as if you are a student in a class and you are watching what the teacher is putting on the whiteboard or the chalkboard. You can see it all in real time online and not have to worry about it. It is a great way to learn online.

Take a look at their solution, whiteboards are great for online academics.