need IM service for my community site with Audio and video support

We have a community website and would like to integrate a messenger service into it so users can IM each other, preferably having audo and video capability.
There are a couple of providers like userplane and toksta that offer them for free. but wanted to know if there are any others that you know of as I would like to compare features and select the most reliable.
thank you
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What evironment are you running on? Linux, windows, php, asp, etc
onlinerackAuthor Commented:
php on linux..

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onlinerackAuthor Commented:
I have accepted the answer you sent as it pointed to the opensource which I never bother to check.... I would like to see if there is one dedicated to integrate with in a dating site so users can talk to each other so something desinged with that in mind.
thank you for your help
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