Free services of Audio & video conferences, calling , Integrated chat, desktop sharing and using White-Boarding Tools and main benefit is Low Bandwidth and Infrastructure Cost.
"OpenMeetings is a free browser-based software that allows you to set up instantly a conference in the Web. You can use your microphone or webcam, share documents on a white board, share your screen or record meetings. It is available as hosted service or you download and install a package on your server with no limitations in usage or users.
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TracBac is not just a replacement for the traditional white board; rather it has been built from the ground up as a visual collaboration platform. TracBac is a visual collaboration platform for designers and clients to interact over a modern browser. It succeeds in narrowing the gap between designers & clients by providing a rugged and easy to use collaboration platform. Features: user-subdomain. Dual mode interaction , Roundtrip integration , Flex based visual collaboration , Content collaboration , Version tracking , Integrated IM & VoIP , Customised Branding , Analytics & Reports