https://thirtydollar.website/ - mario paint type thing

https://www.photopea.com/ - photoshop but in browser

https://haxiomic.github.io/GPU-Fluid-Experiments/html5/?q=UltraHigh - fun weird fluid thingy

https://www.beepbox.co - very basic midi type transcriber

http://lorenhernandez.com/puzzlestuck/ if you haven't played puzzlestuck it's really good