This is a tiny web app that generates pixel sprite sheets based on a template.
Try out the live demo http://artbit.github.io/pixel-sprite-generator/
git clone https://github.com/ArtBIT/pixel-sprite-generator.git
cd pixel-sprite-generator
npm start
Open http://localhost:4000/ in your browser.
Inspired by http://davebollinger.org/works/pixelspaceships/