Virtual whiteboard for sketching hand-drawn like diagrams

The communications platform that puts data protection first.

very good whiteboard SDK / infinite canvas SDK

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.

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

Open-source feature management platform

Build AI-native spreadsheets. Univer is a full-stack framework for creating and editing spreadsheets on both web and server. With Univer MCP, 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.

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.

A complete web conferencing system for virtual classes and more!