What Slack alternative would you recommend - excluding Teams?

• Rocket.Chat

  118 38,801 9.9 TypeScript

  The communications platform that puts data protection first.

  

We landed on Teams since we already pay for it but we hosted our own https://rocket.chat/ for internal IT testing for a year. Worked great.

• sydent

  710 280 6.5 Python

  Sydent: Reference Matrix Identity Server

  

Selfhosted https://matrix.org/ synapse server.

• SurveyJS

  surveyjs.io sponsored

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

• Element

  614 10,602 9.9 TypeScript

  A glossy Matrix collaboration client for the web.

  

https://element.io/ mobile client and web client.

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