extramuros : This is software for collaborative live coding. On one machine, you run an extramuros "server". Then, from as many machines as you like, you use a web...
HedgeDoc : HedgeDoc (formerly known as CodiMD) is an open-source, web-based, self-hosted, collaborative markdown editor.
You can use it to easily collaborate on ...
Riot : 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 ...
Rocket.Chat : Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
It is a great solution for communities and companies ...
Luckysheet is an online spreadsheet like excel that is powerful, simple to configure, and completely open source.