Drawpile is a collaborative drawing program that lets multiple people draw, sketch, paint and animate on the same canvas simultaneously. It's Free and Open Source software available for Windows, macOS, Linux and Android. There's also a Web version that works on all platforms, including iOS.
 Download Drawpile

Update Prompt for Drawpile 2.2

March 2, 2024 by askmeaboutloom

Drawpile 2.1 will now prompt you to update to 2.2. If you already updated to 2.2 manually, you don't need to do anything.

You can find a summary of what changed on this page explaining how to update.