CoolCollaborator

CoolCollaborator is a real-time collaboration and conferencing system that serves as not just VOIP/audio/IM communications, it is also a complete product API that has many collaborative features not available in any single cross-platform product, commercial or free.

Depending on how you will use CoolCollaborator, you may not need to setup a server of your own. It may be the case that you connect to an CoolCollaborator server owned by someone else who has an account created for you. However, you are encouraged to download and install a server of your own and create user accounts to allow users to access data on your server.

CoolCollaborator server provides a persistent, private, multi-user, real-time collaboration environment with many collaborative features such as white boarding, web browsing, instant messaging (IM), file sharing, and VOIP phone calls.

Give CoolCollaborator a try to see how useful it can be for you!