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Open Source Communication & Collaboration Tools

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167 projects, sorted by GitHub stars.

Centrifugo

Alternative toPusher

Scalable real-time messaging server with WebSocket support

  • 10,960 GitHub stars
  • Apache-2.0Licence Apache-2.0

Fluxer

Alternative toDiscord

Self-hosted chat with voice, threads, and no ads

  • 10,850 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #Chat

All In One

Alternative toDropbox

Full Nextcloud stack managed by one Docker container with auto-TLS.

  • 10,819 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

Signal

Alternative toWWhatsApp

A secure messaging app focused on privacy and user experience.

  • 10,780 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
  • #Chat

Rustdesk Server

Alternative toTeamViewer

Self-hosted relay and rendezvous server for RustDesk remote desktop.

  • 10,736 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

Miniflux

Alternative toFeedly

Self-hosted feed reader with tracker removal and 25+ integrations.

  • 9,916 GitHub stars
  • Apache-2.0Licence Apache-2.0

ownCloud

Alternative toDropbox

Self-hosted file sharing with data sovereignty for teams and enterprises.

  • 8,849 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

agentic-inbox

Alternative toSuperhuman

Self-hosted email client with AI agent on Cloudflare Workers

  • 8,550 GitHub stars
  • Apache-2.0Licence Apache-2.0

Mumble

Alternative toTeamSpeak

Free open source low-latency voice chat for gaming teams

  • 8,410 GitHub stars
  • BSD-3-ClauseLicence BSD-3-Clause
  • #Chat

ODS

Alternative toChatGPT

Turn any computer into a private AI server

  • 7,809 GitHub stars
  • Apache-2.0Licence Apache-2.0

Dendron

Alternative toRoam Research

Local-first Markdown notes with hierarchy and backlinks

  • 7,466 GitHub stars
  • Apache-2.0Licence Apache-2.0

Pixelfed

Alternative toFlickr

Fediverse photo sharing: no central platform, fully user-owned

  • 7,143 GitHub stars
  • AGPL-3.0Licence AGPL-3.0
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