voxel.css : The goal of this project is to provide a lightweight 3D CSS library with very simple implementation.
impress.js : It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com
Slate : Slate is a completely customizable framework for building rich text editors.
Slate lets you build rich, intuitive editors like those in Medium, Dropbo...
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
enquire.js : A lightweight, pure JavaScript library for responding to CSS media queries.
Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!