Stampit
Create objects from reusable, composable behaviors.
Steal
Gets JavaScript
Fast.js
Faster user-land reimplementations for several common builtin native JavaScript functions.
Libretaxi
LibreTaxi, free and open source Uber/Lyft alternative to connect passengers and drivers.
Sift.js
filter arrays using mongodb queries
Backbone.stickit
Backbone data binding, model binding plugin. The real logic-less templates.
Machina.js
js ex machina - finite state machines in JavaScript
Curl
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)
Across Tabs
Easy communication between cross-origin browser tabs
Backbone Layout Manager
A layout and template manager for Backbone.js applications.
Humane.js
A simple, modern, browser notification system
Visibility.js
Visibility.js allows you to determine whether your web page is visible to a user, is hidden in background tab or is prerendering. It allows you to use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).
Webshim
Webshims Lib is a modular capability-based polyfill-loading library
jStorage
jStorage is a simple key/value database to store data on browser side. As a bonus it is also a local pubsub platform to sync data between tabs/windows
Fluxxor
Flux architecture tools for React
Mout
Modular JavaScript Utilities
Vue Moment
Handy Moment.js filters for your Vue.js project.