JavaScript today is capable of generating a lot of data. The easiest way to deliver multiple files to your users is in a zip file. Instead of wasting server resources and bandwidth you can get the client to do it for you.

JSZip creates .zip files with Javascript automatically for you. The biggest issue with JSZip is that the filenames are very awkward, Firefox generates filenames such as a5sZQRsx.zip.part, and Safari isn’t much better with just Unknown.

Requirements: Javascript Enabled
Demo: http://jszip.stuartk.co.uk/
License: GPL v3 and MIT License