Backbone.stickit
Backbone data binding, model binding plugin. The real logic-less templates.
Hogan.js
A compiler for the Mustache templating language
Mithril.js
A Javascript Framework for Building Brilliant Applications
Keymaster
A simple micro-library for defining and dispatching keyboard shortcuts. It has no dependencies.
LABjs
Loading And Blocking JavaScript: On-demand parallel loader for JavaScript with execution order dependencies
Ect
Fastest JavaScript template engine with embedded CoffeeScript syntax
Crypto Js
JavaScript library of crypto standards.
jsMessage
Custom messages, alerts, confirmations
Jwerty
Awesome handling of keyboard events
ICanHaz.js
A clean solution for templating with Mustache.js and jQuery or Zepto
Venus.js
where bugs go to die
React Templates
Light weight templates for react
Jsblocks
Better MV-ish Framework
Lazy.js
Like underscore.js, but lazier
Highland
High-level streams library for Node.js and the browser
Stimulus
A modest JavaScript framework for the HTML you already have
Spine
Lightweight MVC library for building JavaScript applications