Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.
A minimal AMD API implementation for use after optimized builds
PxLoader is a simple JavasScript library for creating preloaders and resource downloaders for HTML5 apps.
pushState + ajax = pjax
A small, fast, modern, and dependency-free library for lazy loading.
Pilpil - Progressive Image Loading
A Module Loader for the Web
Very lightweight progress bars. No jQuery
Loads images, scripts, styles, iframes, videos and audio asynchronously.
Lazy load XT is a jQuery plugin for images, videos and other media