michael brough
"You can now play BECOME A GREAT ARTIST IN JUST 10 SECONDS on your cell phone." - Author's description Play here (Browser, iOS, Android) [Via @mcclure111]
paint
"Strike is a web-based, 1-bit paint tool, primarily for quick sketching or line-drawing." - Author's description Play on itch.io (Browser) [Via @_morphous]
lexaloffle
"p.s. feel free to dump test wobblegifs in the replies :>" - Author's description Play here (Browser) [Via @lexaloffle]
browser
"Japanese calligraphy drawing tool" - Author's description Play here (Browser)
free
"This game's time is short, but you will feel mysterious." - Author's description Download on itch.io (Windows) [Via @itchio]
windows
"A psychedelic paint program that lets you draw pretty colors, apply realtime effects and view effects." - Author's description Download here (Windows) Forum thread