Open Source Communication & Collaboration Tools

Alternative toGrok Bot

Your AI agent team in a chat app, local-first and Apache-2.0 licensed

• 5,280 GitHub stars
• Apache-2.0Licence Apache-2.0
• #AI Agents

Alternative toFastmail

Self-hosted email inbox for custom domains on Cloudflare

• 5,117 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toTwilio

Self-hosted WhatsApp REST API with multi-account and webhook support

• 4,937 GitHub stars
• MITLicence MIT
• #Chatbots

Alternative toZoom

Free browser-based video calls with no sign-up required

• 4,800 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toSlack

Open protocol for secure, decentralized messaging and VoIP

• 4,716 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toMicrosoft 365

Free office suite with Writer, Calc, and Impress on any platform

• 4,540 GitHub stars
• GPL-3.0Licence GPL-3.0

InCustomer Support

Open-source tools that work instantly, no signup required

• 4,511 GitHub stars
• GPL-3.0Licence GPL-3.0

Alternative toMicrosoft Translator (Windows Live Captions translation)

Real-time audio translation for Windows, powered by LLMs

• 3,956 GitHub stars
• Apache-2.0Licence Apache-2.0
• #LLM

Alternative toElement

Elegant open source Matrix client for self-hosted chat

• 3,940 GitHub stars
• AGPL-3.0Licence AGPL-3.0
• #Chat

Alternative toWispr Flow

Dictate to any app; AI polishes it. AGPL-3.0, no subscriptions.

• 3,912 GitHub stars
• AGPL-3.0Licence AGPL-3.0