- excalidraw by excalidraw, 136k stars. Hand-drawn style virtual whiteboard for sketching diagrams with others
- zed by zed-industries, 95k stars. High-performance code editor with built-in multiplayer collaboration
- AFFiNE by toeverything, 75k stars. Open-source workspace for docs, whiteboards and planning with CRDT sync
- tldraw by tldraw, 51k stars. React SDK for building infinite canvas apps like whiteboards and diagrams
- zulip by zulip, 26k stars. Self-hostable team chat server and web app with topic-based threads
- univer by dream-num, 25k stars. SDK for embedding spreadsheet, document and slide editing in your app
- linkwarden by linkwarden, 20k stars. Self-hosted collaborative bookmark manager that preserves pages
- docs by suitenumerique, 17k stars. Collaborative real-time wiki and document editor built on Django and React
- TREK by liketrek, 16k stars. Self-hosted travel planner with shared trips, budgets, packing lists and journals
- open-pencil by open-pencil, 9.9k stars. Open source design editor with AI features, aiming to replace Figma
- rivet by rivet-dev, 6.9k stars. Scalable orchestrator for actor-style workloads, including agent workloads
- colanode by colanode, 5.2k stars. Local-first chat and knowledge base app, an alternative to Slack and Notion
- mirotalksfu by miroslavpejic85, 3.2k stars. Self-hosted WebRTC video conferencing with file sharing and live streaming
- hocuspocus by ueberdosis, 2.7k stars. WebSocket server backend for Yjs real-time collaborative editing
- doop by kgoedecke, 2.0k stars. Multiplayer design canvas where humans and AI agents work together over MCP
- docx-editor by eigenpal, 575 stars. React and Vue library for editing .docx files with tracked changes and collaboration
- durable-actors by TerseAI, 361 stars. Actor model runtime on SQLite for stateful multiplayer and agent coordination
- shumai by shumaiOne, 263 stars. Open source video review and collaboration tool, a Frame.io alternative
- linkedrecords by wolfoo2931, 94 stars. Backend-as-a-service built on triplestores, with real-time sync and authorization
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