Very lightweight progress bars. No jQuery
Pilpil - Progressive Image Loading
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.
Load modules on demand (lazy load) in AngularJS
A Module Loader for the Web
A small, fast, modern, and dependency-free library for lazy loading.
pushState + ajax = pjax