ooVoo is already out for Android and iOS with plans to come to BlackBerry 10. It was announced by the President of ooVoo at CES:
“We’re in talks to integrate with [BlackBerry Messenger] and we’re working on a Windows version,” says Jay Samit, president of ooVoo, a video chat service. “But they’re such a niche market.”
You can learn more about ooVoo here.