SOUND RELATED (will require headphones or earbuds)
Keyboard
https://creatability.withgoogle.com/keyboard/
Online Jigsaw Puzzles
https://www.onlinejigsawpuzzles.net/easy-jigsaw-puzzles/
http://www.jigzone.com/
Sound Canvas
https://creatability.withgoogle.com/sound-canvas/
Word Synth
https://creatability.withgoogle.com/word-synth/
Softbuddy
http://www.heysnapshere.com/apps/softbuddy/index.html
Fluid Simulation
https://paveldogreat.github.io/WebGL-Fluid-Simulation/
Color Hunt
https://experiments.withgoogle.com/color-hunt
Art Coloring Book
https://artsandculture.google.com/experiment/art-coloring-book/1QGsh6vSfAQBgQ