melonJS is the result of our enthusiasm and past experiments with Javascript, and came from the feeling that no simple, free and standalone library was available to develop games. And although still a big work in progress (and not yet bug free), melonJS already allows to easily create some nice games (see the Gallery page)
zip.js offers a low-level API for writing and reading large zip files (up to 4GB) with a stable RAM use. It also offers a Filesystem API in order to manipulate zip file structure.
This library is implemented with these HTML5 features:
Web workers
FileReader (and FileWriter optionally)
Blob and BlobBuilder
Typed arrays