Secure and private open source peer-to-peer Instant Messenger.
Conduit is a simple, fast and reliable chat server powered by Matrix. Conduit is an alternative to Synapse and tries to be lightweight and easy to install, but it is still in development.
FaceFlow is a free web-based application for video calling and group video calling. It also offers additional features such as chat rooms.
Skype Lite lets you send free text messages and make voice & video calls even under limited network conditions.
An encrypted instant messaging with video call and GPS features for android.
KakaoTalk is a phone number based messenger service that allows users anywhere in the world to chat one-to-one or in a group for free. (no SMS service)
64Gram (unofficial Telegram Desktop).
The most secure and anonymous messenger, encrypted with Blockchain.
Adamant Messenger Features
The application is a push-to-talk (PTT) walkie-talkie for consumers and business and available for Android, iOS, Blackberry, Windows Phone, Windows PC, rugged mobile devices and two-way radios.
Zello Walkie Talkie Features