Open Source Communication & Collaboration Tools

Alternative toiMyfone ChatsBack

Archive and browse WhatsApp backups locally

• 191 GitHub stars
• GPL-3.0Licence GPL-3.0

Alternative toSlack

Matrix team chat with a companion identity server

• 171 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toWWhatsApp

Free P2P encrypted messaging, calls, and file sharing

• 168 GitHub stars
• GPL-3.0Licence GPL-3.0
• #Chat

Alternative toZoho Mail

AGPL mail backend with an official Flutter client

• 98 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Email

Alternative toElevenLabs

Empathic voice AI SDK with open source emotional models

• 84 GitHub stars
• MITLicence MIT
• #AI SDK

Alternative toConductor

Run a company of AI agents on a server you own.

• 73 GitHub stars
• MITLicence MIT
• #AI Agents

Alternative toSlack

Decentralized open source workplace with chat and docs

• 59 GitHub stars
• MPL-2.0Licence MPL-2.0
• #Chat

Alternative toMEE6

CLI for building AI agents and automating Discord servers

• 38 GitHub stars
• MITLicence MIT
• #AI Agents

Alternative toClaude Code

Open source collaborative workspace for debugging issues

• 23 GitHub stars
• MITLicence MIT

Alternative toSlack

Lightweight self-hosted messaging platform for teams

• 13 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat