Onfire.js
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Lucid Js
LucidJS is a chainable event emitter library. It offers several unique features such as set events, emitter piping, DOM node encapsulation, sub events, along with the usual event triggering and binding. LucidJS emitters also feature meta events that allow listening for event binding and event triggering. LucidJS works in both the browser and node.js.
Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!
Conditioner
Frizz Free, Environment-aware, JavaScript Modules
Webshim
Webshims Lib is a modular capability-based polyfill-loading library
Redux Loop
A port of elm-effects and the Elm Architecture to Redux that allows you to sequence your effects naturally and purely by returning them from your reducers.
PreloadJS
PreloadJS makes preloading assets & getting aggregate progress events easier in JavaScript. It uses XHR2 when available, and falls back to tag-based loading when not.
Refluxjs
A simple library for uni-directional dataflow application architecture inspired by ReactJS Flux
Lunr.js
A bit like Solr, but much smaller and not as bright
Autolink Js
Tiny little tool to find URLs in a string of text and hyperlink them
101
A modern JS utility library
Cellx
Ultra-fast implementation of reactivity for javascript
Diagram
JS tool for making node graphs. Inspired by dependency graph
Pilot
Pilot — multifunction JavaScript router.
Connective
agent-based reactive programming library for typescript
Inject
AMD and CJS dependency management in the browser
Angular History
A history service for AngularJS. Undo/redo, that sort of thing. Has nothing to do with the "back" button, unless you want it to.