jquip : Smaller, Lighter, Faster, more modular jQuery - include only the parts you want! Don't use it, Don't include it.
Push by Nickersoft : A compact, cross-browser solution for using the JavaScript Notifications API
jQuery Masonry : A dynamic layout plugin for jQuery
The flip-side of CSS floats
Anime.js : Anime.js is a fast, multipurpose and lightweight JavaScript animation library with a simple, yet powerful API.
It works with CSS properties, SVG, DOM ...
RAWGraphs : RAW is an open web tool to create custom vector-based visualizations on top of the amazing d3.js library.
Primarily conceived as a tool for designers ...
Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.