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You can chat one-on-one, or add more participants (up to 10), using your phone's front or rear camera.
Video calls, and even most voice calls, are free to any other Hangouts user.
What's great: Hangouts organizes your conversations by person, and you can send messages, and start voice and video calls from one place.
What's great: Of all the apps on this list, Imo is the easiest to use for video chatting.