Stately.js
Stately.js is a JavaScript based finite-state machine (FSM) engine for Node.js and the browser.
Diagram
JS tool for making node graphs. Inspired by dependency graph
Backbone React Component
A bit of nifty glue that automatically plugs your Backbone models and collections into your React components, on the browser and server
Backbone Associations
Create object hierarchies with Backbone models; Respond to hierarchy changes using regular Backbone events.
Vis
Dynamic, browser-based visualization library
Lunr.js
A bit like Solr, but much smaller and not as bright
Bacon.js
FRP (functional reactive programming) library for Javascript
Machina.js
js ex machina - finite state machines in JavaScript
Inject
AMD and CJS dependency management in the browser
JS Signals
Custom Event/Messaging system for JavaScript inspired by AS3-Signals
History.js
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.
Tock
Timer Object/Class. Kickass!
Polished
A lightweight toolset for writing styles in JavaScript ✨
Node Browserify
browser-side require() the node.js way
Tangle
a JavaScript library for reactive documents
Modernizr
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
UA Parser
Lightweight JavaScript-based User-Agent string parser. Supports browser & node.js environment. Also available as jQuery plugin.