SyncPaint 
SyncPaint allows multiple users to draw on one canvas at the same time. You can draw together with other people simply by sharing the link to your room.
Dependencies
Build from source
npm install
npm run build
For a production build use npm run build-prod.
Run
Run node app.js to start the app. Then navigate to http://localhost:3000.
Live version is available at: syncpaint.com.
Build and run with Docker
docker build . -t syncpaint:latest
docker run -p 3000:3000 syncpaint:latest