Mac Skype, currently at Version 7.x is one of the most ubiquitous and reliable cross-platform video conferencing apps: It isn't just for free & very low-cost long distance Mac VOIP video and voice calling.
With the explosion of camera enabled Apple IOS devices, along with the Macintosh's increasing market penetration, Apple's Face Time conference app has become a formidable contender with an installed base in the hundreds of millions of i Phone, i Pad and Mac OSX users.
It's lack of compatibility with Windows or Andriod OS is unfortunate - but Face Time is a global success regardless.
Offers both 'Nice' Social as well as Frisky Adult chat rooms you can browse.
A commercial app that offers a free 21-day trial to test drive.
The still VERY popular i CUii software once used it and was both Mac and Windows compatible.