Open Source Communication & Collaboration Tools

Alternative toHappy Scribe

Local speech-to-text transcription and subtitling with a web UI

• 3,093 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toWispr Flow

Free, open source Mac dictation with AI cleanup and voice macros

• 2,946 GitHub stars
• MITLicence MIT

Alternative toRecall.ai

Self-hosted meeting bot API for Meet, Teams, Zoom, and Jitsi

• 2,894 GitHub stars
• Apache-2.0Licence Apache-2.0
• #Open Core

Alternative toMicrosoft Teams

End-to-end encrypted messaging, voice, and file sharing

• 2,781 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toThreema Work

Free encrypted P2P messaging and voice calls, no servers

• 2,696 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Chat

Alternative toSlack

Peer-to-peer serverless chat app with no central server

• 2,659 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Chat

Alternative toMailchimp

Send newsletters and track analytics from your own email server

• 2,239 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email

Alternative toDiscord

Free open source Discord reimplementation with full API parity

• 2,210 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toGoogle Maps

OpenStreetMap and Google data, no account, no Play Services

• 2,060 GitHub stars
• GPL-3.0Licence GPL-3.0

Alternative toFront

Open source collaborative email with shared team inboxes

• 1,758 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email