Skype is the best app to stay in touch with family and friends from all around the globe. It provides free video messaging at little to no cost. Instant messaging, call-forwarding and landline calls are also available as well as mirroring your skype calls to Chromecast.
The app is free to download and use, however, if you want to call landline phones or send SMS, you might need to buy a subscription or pay a small fee.
Note:This application requires users to have working speakers and a microphone, in order to use all of its features.