Face Time

With Skype and other apps, there is really no reason to have an Android only app and exclude other phones like Facetime. Even with my families, most of them have Skype running on their iPhones.
 
You have Google+ which can run on IOS devices and Android devices.

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Google Talk works extremely well

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I use Tango works perfect. Works on any operating system uses real phone numbers; so when someone registers their Tango app and they are already in your phone contacts list you can video chat with them and Tango will ring on device simillar to a phone call. Sorry if I soud like a salesman just my 2 cents.

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I use Google+ Tango and oovoo to video chat

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