1. Element is a secure collaboration and messaging app based on the Matrix protocol. It’s decentralised to deliver digital sovereignty, and based on an open standard for easy connections and interoperability. It is end-to-end encrypted by default.
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    • FreemiumProprietary
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • BSD
    • iPad
    • Electron / Atom Shell
    • FreeBSD
    • Playstation
    Whether you’re part of a school club, a gaming group, a worldwide art community, or just a handful of friends that want to spend time together, Discord makes it easy to talk every day and hang out more often. Create an invite-only place.


  2. Slack is a unified communication platform built with an optimized workflow to keep modern teams focused and productive. A familiar chat interface facilitates discussions while advanced features are easily exposed based on context.
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  3. Mattermost is a secure, open source platform for communication, collaboration, and workflow orchestration across tools and teams.
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  4. Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
  5. TeamSpeak is a proprietary Voice over IP software that allows users to speak on a chat channel with other users, much like a telephone conference call. A TeamSpeak user will often wear a headset with an integrated microphone.
  6. Watch2Gether lets groups of users watch videos in-sync together. At the same time users can communicate through a build-in chat-room and use web cam and audio chat. Available media sources are Youtube, Vimeo, Dailymotion and Soundcloud.
  7. AirSend is a simple collaboration space for professionals and small teams that brings all your conversations, files, notes, and to-do lists into one place so that you can get work done faster and easier.
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  8. OpenTogetherTube lets you watch videos with your friends as easily as possible. It's completely open source, and able to be easily self-hosted via provided docker images. Has support for: - Youtube - Vimeo - Dailymotion - Reddit - Tubitv
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  9. Glip is instant messaging for teams and businesses to communicate and get work done at the same time. In Glip you work where your conversations are, so you always know what your team is doing and what needs to get done next.
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  10. The free and open-source Crust Messaging is a secure, high performance,Slack alternative that allows your teams to collaborate more efficiently, as well as communicate safely with other organisations or customers.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Python
    • JavaScript
    • ZeroNet
    An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet stack. In addition, making a new chatroom website is a simple as downloading the files and cloning the site.

    Discontinued

    Last update on github made over 5 years (March 13, 2016).

  11. Ever wanted to watch a video on YouTube or Vimeo simultaneously with your friends, who are not exactly sitting next to you? Well, now you can!
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  12. Zero Knowledge, end-to-end encrypted collaboration tool for teams and businesses. Reviewable source code. Python wrapper for bots & integrations. Encryption white paper. Native offline mode. Faster file-sharing. Built for enterprise.
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  13. Facechat - Facebook dating. Meet new friends around the world. Free online chat rooms LIVE! no e-mail, no password, no registration, 100% anonymous, chat in your own language.