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Nextcloud TalkZulip
Free

Free and open source as part of a Nextcloud server you host.

 Freemium

The server and clients are free and open source and can be self-hosted at no cost. Zulip…

Android, Web, Self-hosted Windows, macOS, Linux, Android
  • Runs on your own server
  • Chat, calls and webinars in one app
  • Topic-based threading inside channels, which makes catching up genuinely practical
  • Self-hostable, or hosted, with free plans for open-source communities
  • Needs a Nextcloud server to use
  • Setting up reliable video calls takes extra server work
  • The topic model takes getting used to and needs team discipline to work
  • The desktop client shares most of its code with the web app, so it inherits its quirks
Downloadable app, Web application, Self-hosted Downloadable app
Open source Open source
License not stated License: Apache-2.0
Account needed Account needed
Needs internet Needs internet

Checked September 23, 2026

Checked September 21, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.