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Open Source Communication & Collaboration Tools

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167 projects, sorted by GitHub stars.

Outline

Alternative toNotion

Team wiki and knowledge base with realtime collaboration

  • 41,224 GitHub stars

Novu

Alternative toCourier

Open source notification infrastructure for product teams

  • 40,319 GitHub stars
  • MITLicence MIT

Chatwoot

Alternative toZendesk

Self-hosted customer support inbox with live chat, email, and AI.

  • 39,630 GitHub stars
  • MITLicence MIT

Mattermost

Alternative toSlack

Team messaging for security-sensitive teams with air-gap support

  • 39,572 GitHub stars
  • #Chat

Handy

Alternative toWispr Flow

Free offline speech-to-text: runs on Windows, macOS, and Linux

  • 38,363 GitHub stars
  • MITLicence MIT

Nextcloud

Alternative toMicrosoft OneDrive

Self-hosted collaboration hub with file sync, calendar, and messaging.

  • 37,508 GitHub stars
  • AGPL-3.0Licence AGPL-3.0

WeKnora

Alternative toGlean

Self-hosted knowledge base with RAG search, AI agent, and wiki

  • 37,193 GitHub stars
  • MITLicence MIT
  • #LLM

bitchat

Alternative toElement

Bluetooth mesh and Nostr chat with no accounts or servers.

  • 37,123 GitHub stars
  • UnlicenseLicence Unlicense
  • #Chat

Ntfy

Alternative toPushover

Self-hosted push notifications via HTTP PUT, no sign-up required.

  • 35,467 GitHub stars
  • Apache-2.0Licence Apache-2.0

meetily

Alternative toJJamie

Privacy-first AI meeting notes that run entirely on your device

  • 32,639 GitHub stars
  • MITLicence MIT

Jitsi

Alternative toZoom

Free video conferencing you can self-host with no account needed

  • 30,215 GitHub stars
  • Apache-2.0Licence Apache-2.0
  • #Video

Srs

Alternative toAnt Media Server

Self-hosted real-time media server with RTMP, WebRTC, HLS, and SRT

  • 29,439 GitHub stars
  • MITLicence MIT
  • #Video
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