Virtual whiteboard for sketching hand-drawn like diagrams

very good whiteboard infinite canvas 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.

Shared data types for building collaborative software

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

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

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

开源白板工具（SaaS），一体化白板，包含思维导图、流程图、自由画等。All in one open-source whiteboard tool with mind, flowchart, freehand and etc.

Open-source feature management platform

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

Build AI-native spreadsheets. Univer is a full-stack framework for creating and editing spreadsheets on both web and server. With Univer Platform, Univer Spreadsheets is driven directly through natural language.

PLANKA is the Kanban-style project mastering tool for everyone

The AI developer platform. Use Weights & Biases to train and fine-tune models, and manage models from experimentation to production.

CodiMD - Realtime collaborative markdown notes on all platforms.

A complete web conferencing system for virtual classes and more!

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

HedgeDoc - Ideas grow better together

A web based file manager,web IDE / browser based code editor

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 Vulnerability Management Platform

🧩 Content editing tech stack for the web - BlockSuite is a toolkit for building editors and collaborative applications.

PartyKit simplifies developing multiplayer applications

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

Library for building distributed, real-time collaborative web applications

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