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Developer: Skype Communications
Skype is a well-known popular app used across PCs and mobile devices. The free service -- unless you also want an international Skype number -- can be used to make voice and video calls, as well as to send instant messages.
ooVoo Video Call, Text and Voice
Name: ooVoo Video Call, Text and Voice
ooVoo allows you to sent free video and voice calls, add up to 12 people to a video conference, as well as sent texts to contacts. With over 90 million users, the cross-platform service's popularity is based on one main thing: high-quality video.
In the same way that Google Hangouts does, this app allows you to apply a number of filters and effects while on a video call.
Name: Facebook Messenger
Facebook, being one of the most popular social networks worldwide, is not just about posting and reviewing status updates. Instead, the messenger feature is also useful for sending quick text, link and picture-based messages -- and so a dedicated Facebook messenger application is a reliable and free way to keep in contact.