WhatsApp Messenger is an instant messaging platform owned by Facebook.

Glip is fully searchable, real-time group chat; video chat, task management, file sharing app.

ICQ is an open source instant messaging software.

Matrix is an open protocol for real-time communication. It is designed to allow users with accounts at one communications service provider to communicate with…

Dialog Messenger is a handy and feature-rich enterprise multi-device messenger available for server or cloud.

Trillian is a proprietary multiprotocol instant messaging application.

Ring (SFLphone) is an open-source SIP-compatible softphone and instant messenger for Linux, Microsoft Windows, OS X and Android.

Path is a social networking-enabled photo sharing and messaging service for mobile devices.

Conversations is an open source XMPP/Jabber client for the Android platform.

KeepCalling is an online calling application.