Offline
Automatically display online/offline indication to your users. #hubspot-open-source
Idle.js
Javascript activity library for the browser. (away, idle, etc)
Trial Js
Mouse position monitoring and user input prediction
Hex Rgb Conversion
181 byte two way conversion micro-library for Hexadecimal & RGB colors
Pjs
Classes for javascript that don't suck.
Es2015 I18n Tag
ES2015 template literal tag for i18n and l10n (translation and internationalization)
Cutter.js
Truncate HTML code to limit its length by number of words without losing markup.
Battery.js
A tiny wrapper for the HTML5 Battery Status API.
Objgrep
Find strings inside complicated javascript objects
Natural Regex
Create regex from natural language
Mincss
Tool for finding out which CSS selectors you're NOT using.
Qrcodejs
Cross-browser QRCode generator for javascript
Jquery Zoomer
Zoom up your iFrames
Livestamp.js
A simple, unobtrusive jQuery plugin that provides auto-updating timeago text to your timestamped HTML elements using Moment.js.
Easy A/B
A jQuery / Zepto plugin for easily setting up A/B and Multivariate tests using Analytics.
Wordcount.js
Calculate file newlines, word, and byte counts on client side using HTML5 File API. (Emulates Linux's wc command)
Js Pdf
Generate PDF files in JavaScript. HTML5 FTW.