Mjml
MJML: the only framework that makes responsive-email easy
Alertify.js
JavaScript Alert/Notification System
Dna.js
An uncomplicated user interface library for semantic templates
Simplate
A simple, but powerful, templating engine for JavaScript.
Cram
Simple AMD and CommonJS module bundler.
Nunjucks
A jinja2-inspired templating system for javascript
jTypes
jTypes is the most comprehensive and robust JavaScript library for overcoming differential inheritance with prototype-based objects. Its lightweight yet powerful design provides web programmers on any platform or browser the ability to emulate classical inheritance where objects are defined by classes.
Sproutcore
JavaScript Application Framework - JS library only
Cellx
Ultra-fast implementation of reactivity for javascript
Hermes.js
Message and Error logger implementation
Hamsters.js
100% Vanilla Javascript Multithreading & Parallel Execution Library
LABjs
Loading And Blocking JavaScript: On-demand parallel loader for JavaScript with execution order dependencies
Kefir
A Reactive Programming library for JavaScript
Script.js
Asyncronous JavaScript loader and dependency manager
Overmind
Overmind - Frictionless state management
Nuxt.js
The Vue.js Developers Framework
Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.