Js-loader-examples is a project mainly written in JavaScript, it's free.
This is a set of examples for how to load a reasonably complex set of JavaScript files using a bunch of different JS loader libraries. It is not scientific, in fact it is likely to be extremely biased seeing as how I'm the author of one of said libraries. I'm just doing this to get a better idea of what's out there.
Load libraries I'm aiming to cover: