Hello friends!
I built an infinite canvas where you can draw together in real time called DrawTheBlock: https://drawtheblock.itch.io/drawtheblock

DrawTheBlock is an infinite pixel canvas shared by everyone online, divided into 1024 x 1024-pixel blocks. You draw with a real brush engine (pressure-style brushes, a hard pixel pencil, fill, eraser), and your strokes have no timer.
Other artists' cursors and strokes appear in real time as they work. Edits stay local until you hit Save, and saved work becomes a permanent part of a world anyone can wander. Create new blocks on empty space, or claim blocks and decide who may draw on them: everyone, only you, or a whitelist of friends.
Native versions for Windows and Linux are available for download on Itch.io. MacOS is coming soon! If you don't want to download, you can play DrawTheBlock in your browser at: https://drawtheblock.com/
Best Regrads,
Truong Bui