jskidpix (via Hacker News):
JS Kid Pix / Kid Pix 1.0 was released in to the public domain and this is an HTML/JS reimplementation.
[…]
Just like the original Kid Pix, there’s no guide—have fun! Most of the tools support Shift (^) to enlarge. There are a handful of hidden tool features behind various modifier keys (⌘, ⌥, ⇧). The modifier keys can also be combined.
Previously: