Web Meeting thats Open source and free to use for up to 20 users with DimDim

This is an open source tool that allows you to host Web Meetings for up to 20 participants for free.  It just uses your browser and flash so there is no need to install anything.

It's easy to set up and comes in extra flavours if you require more people to attend.  Features include screen sharing, chat, video and voice broadcasting.

They are hosting live meeting demonstrating the tool all the time, so visit http://www.dimdim.com/ now and click on a meeting demo on the right hand side.

If you don't like the idea of using their hosting then you can download the system as a VMWare image and run your on managed server, this is free and alows upto 100 users for free.