Trillian is a proprietary multiprotocol instant messaging application.

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…

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

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

KeepCalling is an online calling application.