Web 2.0 Tech Tools for 21st Century Teaching and Learning
Desktop Conferencing ToolsDimdim - web conferencing for up to 20 people (there is a pro version but you can create a free account too).
Elluminate - three for free web conferencing.
Mikogo - screen sharing application that includes file transfer and remote control. You need to download the application but the person you are sharing with does not.
spreed - free web conferencing, online meetings and web collaboration (up to three people).
Yugma - allows anyone, anywhere to instantly share their desktop and ideas online with others.
Vyew - anytime collaboration and live web conferencing.