The University of Southern Mississippi has just integrated a web conferencing tool called Wimba Pronto, but it is hardly free and it is tied into the personel management system of the University but the premise between that product and these is the same. Create a rich interactive environment for learning and presenting to take place.

I’ve used Adobe Connect before and absolutely loved it! Adobe has tied this in as a part of Acrobat.com and in their Creative Suite Products. The free version is limited only in the number of people that can join the room, but it still works very well.

I tried Big Blue Button the other day, but I didn’t have anyone to meet with so it didn’t do anything for me. The customizability of the desktop and arrangement of the windows looked and felt very much Adobe Connect’s interface.

My suggestion would be to get in and play with them and find the one that works the best for you. Be sure to look at the limitations and security before you actually go for a live meeting or training.