Tox is a peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption.

Nimbuzz is a proprietary cross-platform instant messaging aggregator for smartphones, tablets and personal computers developed by Nimbuzz B.V. Nimbuzz has 150…

KakaoTalk (Korean: 카카오톡), or sometimes KaTalk, is a free mobile instant messaging application for smartphones with free text and free call features.

Bleep is a fun and easy instant messaging app that is completely private.

Viber Free Messenger and Phone Calls.

Voxeet is VoIP web conferencing software that uses 3D high definition voice technology to produce immersive sound.

Talkatone is a free calling app.

Plouder provides international calling facility.