Spine
Lightweight MVC library for building JavaScript applications
Ect
Fastest JavaScript template engine with embedded CoffeeScript syntax
React Templates
Light weight templates for react
LABjs
Loading And Blocking JavaScript: On-demand parallel loader for JavaScript with execution order dependencies
ICanHaz.js
A clean solution for templating with Mustache.js and jQuery or Zepto
Stimulus
A modest JavaScript framework for the HTML you already have
Mithril.js
A Javascript Framework for Building Brilliant Applications
Q
A tool for making and composing asynchronous promises in JavaScript
jsMessage
Custom messages, alerts, confirmations
Lazy.js
Like underscore.js, but lazier
Impress
Impressive totalitarian style Multipurpose Application Server for node.js. All decisions are made. Solutions are scaled. Tools are provided and optimized for high load. Ready for applied development and production.
Venus.js
where bugs go to die
Jsblocks
Better MV-ish Framework
Express
Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Firebase Js Sdk
Firebase Javascript SDK
Hoodie.js
hoodie super power to the frontend!
Highland
High-level streams library for Node.js and the browser