Mattermost is an open source, private cloud Slack-alternative, Workplace messaging for web, PCs and phones. MIT-licensed.

Tresorit is an online cloud storage service based in Switzerland and Hungary that emphasizes enhanced security and data encryption for Businesses.

Rocket.Chat free open source chat solution.

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

Qiscus provide everything you need to power up your app with chats.

Grape is an REST-like API framework for Ruby. It's designed to run on Rack or complement existing web application frameworks such as Rails and Sinatra by prov…

Zulip is a chat and collaborative software.

Wire is a cross-platform, encrypted instant messaging client created by Wire Swiss. It is available for iOS, Android, Linux, Windows, macOS and Web browser cl…

HipChat is a web service for internal private online chat and instant messaging.

ChatSecure is a messaging application for iOS which allows OTR and OMEMO encryption for the XMPP protocol.

Hibox provides task management, business chat and video calls.

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

Fleep enables communication within and across organizations, be it your team chats, project communication or 1:1 conversations.

Wickr is an instant messenger application.