Fine Uploader is a multiple file upload plugin with image previews, drag and drop, progress bars. S3 and Azure support, image scaling, form support, chunking, resume, pause, and tons of other features.
Validatr is a jQuery plugin that relies on using modern HTML5 input attributes to perform validation.
Lity is a ultra-lightweight, accessible and responsive lightbox plugin which supports images, iframes and inline content out of the box. It requires jQuery or Zepto
jcSlider is a jQuery plugin to create responsive slider with CSS animations.
jQuery.rest is a jQuery plugin for easy consumption of RESTful APIs.
RegExpBuilder integrates regular expressions into the programming language, thereby making them easy to read and maintain.
Regular Expressions are created by using chained methods and variables such as arrays or strings.
Markvis is a plugin to generate charts in markdown with few lines of code.
With Bowser you can get browser information, device information (mobile/tablet), OS information (MAC, Windows, linux, iOS, Android, WindowsPhone etc.)
A tutorial about creating SVG line animations of different animals by using Snap.svg
Pell is the simplest and smallest WYSIWYG text editor for web, with no dependencies.
humane.js is a simple, modern, framework-independent, well-tested, unobtrusive, notification system.
Utilizes CSS transitions when available, falls back to JS animation when not. Includes mobile support.