Linphone is a free voice over IP (VoIP) service and SIP client.

WeChat is a social media with instant messaging, commerce and payment services application.

Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution.

LINE is a new communication app which allows you to make free voice calls and send free messages whenever and wherever you are.

BlackBerry Messenger, also known as BBM is an instant messenger and videotelephony application included on BlackBerry devices that allows messaging and voice …