Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms. Its features include File sharing, Video conferencing, Screen sharing, Live chat, Link preview and lot more. 

RocketChat - The ultimate open source web chat platform

Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming. Meeting can be recorded and screen sharing support is also available. 
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Its feature include Private message center, User and room management, Multi-Whiteboard and Chat, User permission and Moderating System, Polls and Votes, Backup and lot more.

Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools using API functions of the Red5 Streaming Server for Remoting and Streaming. Meeting can be recorded and screen sharing support is also available. 

Openmeetings - Open Source Web Conferencing

Riot is built on top of Matrix. Matrix is an open network for secure, decentralized communication delivering a community of users,bridged networks, integrated bots and applications plus full end-to-end encryption. Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot will allow these team members to seamlessly work together. Riot offers the richest network of communication bridges.

Riot - Messaging and Colloboration made easy 

Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distributing and persisting JSON over an open federation of servers. It can be used for Decentralised Group Chat, WebRTC signalling, Internet of Things, VOIP etc.

Matrix - Decentralized group communication

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RocketChat - The ultimate open source web chat platform

Openmeetings - Open Source Web Conferencing

Riot - Messaging and Colloboration made easy

Matrix - Decentralized group communication

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RocketChat - The ultimate open source web chat platform

Openmeetings - Open Source Web Conferencing

Riot - Messaging and Colloboration made easy

Matrix - Decentralized group communication

TechStack

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