Slate : Slate is a completely customizable framework for building rich text editors.
Slate lets you build rich, intuitive editors like those in Medium, Dropbo...
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 ...
rsvp.js : A lightweight library that provides tools for organizing asynchronous code
ClippyJS : Add Clippy or his friends to any website for instant nostalgia.
Microjs : Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
Aloha Editor is an open source WYSIWYG editor that can be used in webpages. Aloha Editor aims to be easy to use and fast in editing, and allows advanced inline editing.