For now, a showcase of some useful hacks:
https://jonathanhyoung.github.io/eggshaker.html Turn your phone into an egg shaker.
https://jonathanhyoung.github.io/sandblock.html Turn your phone into a sand block.
https://jonathanhyoung.github.io/transcriber/ Turn your phone into a closed-caption device.
https://jonathanhyoung.github.io/random-bartletts.html Get a random quotation from Barlett's Familiar Quotations every time you reload.