Self hosted alternative to teams / slack, for file sharing and instant messaging?

This page summarizes the projects mentioned and recommended in the original post on /r/selfhosted
Communication systems Custom Matrix Synapse Collaboration

SurveyJS
Our great sponsors
  • SurveyJS - Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App
  • InfluxDB - Power Real-Time Data Analytics at Scale
  • WorkOS - The modern identity platform for B2B SaaS
Our great sponsors

  • sydent

    Sydent: Reference Matrix Identity Server

    • Not as feature-full as some other options listed but check out Matrix https://matrix.org/

  • Zulip

    Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

    • One of the best solutions is missing in my Opinion: Zulip (https://zulip.com/). It has a very cool Threading model to not clutter up conversations and keep them organized, is well documented and installation is very straightforward.

  • SurveyJS

    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.

    SurveyJS logo

  • Element

    A glossy Matrix collaboration client for the web.

  • Twake

    Twake is a secure open source collaboration platform to improve organizational productivity.

NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

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