Handlebars.js
Handlebars provides the power necessary to let you build semantic templates effectively with no frustration. An extension to the Mustache templating language created by Chris Wanstrath.
Superagent
Ajax with less suck - (and node.js HTTP client to match)
jQuery File Upload
File Upload widget with multiple file selection, drag&drop support, progress bars and preview images for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image resizing. Works with any server-side platform (PHP, Python, Ruby on Rails, Java, Node.js, Go etc.) that supports standard HTML form file uploads.
Quill
A cross browser rich text editor with an API
Less.js
Leaner CSS
Ng Zorro Antd
An enterprise-class UI components based on Ant Design and Angular. 🐜
Handsontable
Handsontable is a minimalist Excel-like data grid editor for HTML & JavaScript
Jquery Handsontable
Handsontable is a minimalistic approach to Excel-like table editor in HTML & jQuery
Clipboard.js
:scissors: Modern copy to clipboard. No Flash. Just 2kb :clipboard:
Summernote
Super simple WYSIWYG editor
Bluebird
Bluebird is a full featured promise library with unmatched performance.
Framework7
Full Featured HTML Framework For Building iOS & Android Apps
Selectize.js
Selectize is the hybrid of a textbox and <select> box. It's jQuery based and it has autocomplete and native-feeling keyboard navigation; useful for tagging, contact lists, etc.
Backbone
Give your JS App some Backbone with Models, Views, Collections, and Events
Phantomjs
Scriptable Headless WebKit
Sweetalert
A beautiful replacement for JavaScript's "alert"
Cleave.js
Cleave.js has a simple purpose: to help you format input text content automatically.