https://t.me/DrawingAppBot
(source: https://github.com/piliugin-anton/telegram-webapp-contest/commit/217c3cf0566a4f9a051a939a3d194d72dfcfdfe3)

This WebApp helps to create hand-drawn pictures, make drawing GIF animations and videos

Great app! Would've been better if export worked through the bot rather than the link.