Linen.js is a Javascript library for the HTML5 Canvas API designed to simplify 2d drawing for common tasks.
The Linen library started out as a way to expedite printed and digital prototyping of card games. The name "Linen" comes from a printed asset finish called "linen" that is commonly used on playing cards.
Linen could use some help if it is to become usable in projects. Completed documentation including examples would be a good start.
You can find examples here.