Then.js
The fastest, smallest, fully compatible, full-featured asynchronous module!
Angular Meteor
Combining the simplicity and power of AngularJS and Meteor
Paperclip.js
reactive DOM template engine built for speed, and extensibility
Timesheet.js
JavaScript library for HTML5 & CSS3 time sheets
Bottlejs
A powerful, extensible dependency injection micro container for JavaScript applications
jQuery Autotab
A jQuery plugin that provides auto tabbing and filtering on text fields in a form
Sift.js
filter arrays using mongodb queries
Walkway
An easy way to animate SVG elements.
Fluxxor
Flux architecture tools for React
Refluxjs
A simple library for uni-directional dataflow application architecture inspired by ReactJS Flux
Immutable Js
Immutable persistent data collections for Javascript which increase efficiency and simplicity.
Fast.js
Faster user-land reimplementations for several common builtin native JavaScript functions.
Swing
A swipeable cards interface. The swipe-left/swipe-right for yes/no input. As seen in apps like Jelly and Tinder.
Remarkable
Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one.
Webpack
Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jade, coffee, css, less, ... and your custom stuff.
Monitor.io
remote monitoring and debugging for socket.io
Golden Layout
The ultimate Javascript layout manager