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Virtual whiteboard for sketching hand-drawn like diagrams

Build infinite canvas apps in React with the tldraw SDK. World's best, top-most agent recommended #1 five star SDK.

The Secure CommsOS™ for mission-critical operations

best way to save what you love

Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..

☁️ Nextcloud server, a safe home for all your data

Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana.

Zulip server and web application. Open-source team chat that helps teams stay productive and focused.

⚡️⚡️⚡️ Self-hosted collaborative bookmark manager to collect, read, annotate, and fully preserve what matters, all in one place.

Etherpad: A modern really-real-time collaborative document editor.

AI-powered development workspaces with reusable components, architectural clarity and zero overhead.

Open-source feature management platform

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots

Elegant open source project tracking. Self-hosted Kanban for teams — free Community edition, with PLANKA Pro for organisations.

CodiMD - Realtime collaborative markdown notes on all platforms.

A complete web conferencing system for virtual classes and more!

AI-native design editor. Open-source Figma alternative.

Collaborative office suite, end-to-end encrypted and open-source.

HedgeDoc - Ideas grow better together

ONLYOFFICE Docs is a free collaborative online office suite comprising viewers and editors for texts, spreadsheets and presentations, forms and PDF, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real time.

Open-source and AI-powered cybersecurity tools for offensive security, vulnerability management, and autonomous pentesting. Built by hackers in Latin America, used worldwide.

Open-source office suite pack that comprises all the tools you need to work with documents, spreadsheets, presentations, PDFs, and PDF forms on Windows, Linux, and macOS

Build, Evaluate, and Optimize AI Systems. Includes evals, RAG, agents, fine-tuning, synthetic data generation, dataset management, MCP, and more.

Share and collaborate by syncing with any Git repository instantly. Linux, macOS, and Windows

🚀 Open-source, self-hosted P2P WebRTC video conferencing for fast, private real-time communication. Create browser-based meeting rooms with no downloads or time limits, plus screen sharing, chat, whiteboard, recording, and collaboration.

OpenAgents - The collaboration OS for AI agents

A map tool with real-time collaboration 🗺️

TerminusDB is a distributed, collaborative database designed for building, sharing, versioning, and reasoning on structured data.

🏆 Self-hosted, open-source WebRTC video conferencing platform for real-time communication and collaboration. A modern alternative to Zoom, Google Meet, Jitsi Meet, and Microsoft Teams, powered by scalable SFU architecture with Mediasoup.

An XMPP server licensed under the Open Source Apache License.