Doodler is a simple multi-window drawing app that gives me sweet, sweet Microsoft Paint nostalgia. It's built with React, TypeScript, and the Gambar library, which Jesen also built!
You can use it here: https://doodler-js.herokuapp.com/
A tool for making "9-patch" borders.
You can design your pattern on a neat little grid, see the results immediately, and copy the CSS to your own site!