Preact is an attempt to recreate the core value proposition of React using as little code as possible, with first-class support for ES2015. Currently the library is around 3kb (minified & gzipped).
Cutestrap is a sassy, opinionated CSS Framework. Cutestrap is a tiny alternative to Bootstrap.
ng-file-upload is a lightweight Angular directive to upload files with optional FileAPI shim for cross browser support.