The following is a list of web conferencing tools. Most of them are free or have free trails/versions
DimDim is probably the most popular free web conferencing tool. It is very quick and easy to host meetings or join meetings.
Yugma is another web conferencing tool. It has free and paid pro versions. It works on windows, mac and linux
Vyew.com is another free always on web conferencing tool.
Flash Meeting is a slightly cumbersome and lesser known tool
Yuuguu is another tool that works on windows, mac and linux.
If you know of any other tool, please leave the details in the comments section
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