Campfire helps you easily collaborate online in real-time.

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

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

Flowdock is a group chat for teams which integrates with GitHub, Jira, Trello.

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

Let's Chat is a persistent messaging application that runs on Node.js and MongoDB. It's designed to be easily deployable and fits well with small, intimate te…

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…

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform.

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

Gitter is an open source instant messaging and chat room system for developers and users of GitHub repositories.

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

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