If you need a cross-platform video messaging client, then one of your top choices is ooVoo. You can download it for PC and Mac as well as Android and iPhone. You can make conference calls with up to 12 participants at once, all on different platforms. Since it is entirely free, you shouldn’t really worry about any monthly fee. That being said, you can upgrade your account to premium if you want to enjoy more features. Or you can use ooVoo credits if you prefer to pay per use. You can take advantage of OoVoo Coupons either way.