Contra
Asynchronous flow control with a functional taste to it
Theory
Abstraction layer for cross platform JavaScript.
Nunjucks
A jinja2-inspired templating system for javascript
JayData
JayData is a unified data access library for JavaScript to CRUD data from different sources like WebSQL/SQLite, IndexedDB, MongoDb, ASP.NET WebAPI, OData, HTML5 localStorage, Facebook or YQL. The library can be integrated with KendoUI, Knockout.js, Handlebars.js or Sencha Touch 2 and can be used on Node.js as well.
Terrificjs
Terrific JavaScript Framework
Lodash
An alternative to Underscore.js, delivering consistency, customization, performance, and extra features.
Hamsters.js
100% Vanilla Javascript Multithreading & Parallel Execution Library
Delorean
An Agnostic, Complete Flux Architecture Framework
Cycle Core
A fully reactive JavaScript framework for Human-Computer Interaction
Connective
agent-based reactive programming library for typescript
Straw
Realtime processing framework for Node.js
Pilot
Pilot — multifunction JavaScript router.
Black Hole.js
Renders black hole gravitational lensing effects in an image canvas using WebGL, glfx.js, and numeric.js
Simulacra
One-way data binding for web applications.
Onfire.js
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Conditioner
Frizz Free, Environment-aware, JavaScript Modules
Modules Webmake
Bundle CommonJS/Node.js modules for web browser