CCXT is a JavaScript / Python / PHP library for cryptocurrency trading and e-commerce library with support for many (90+) bitcoin/ether/altcoin exchange markets and merchant APIs.
addUI Store is an easy to use jQuery plugin that adds a fully featured store to any website in minutes. The store plugin is written in pure JavaScript (jQuery). PHP is used to secure the store (validate the items' costs / cart's total) and securely process payments.
Responsive Img swaps out an image's src attribute based on its container's width when the DOM is ready and when the browser is resized.
Using a PHP file, Responsive Img creates new images on the fly the first time they're needed and puts them on your server.
Responsive Img takes pixel ratio into account and uses larger images for Retina display and displays with other pixel ratios.
jCookies, a jQuery plugin, makes getting and settings HTTP Cookies a breeze. jCookies allows the storage of any type of data: strings, arrays, objects, etc. Data is stored in the cookie as JSON data. Also you can retrieve data using server side code such as C# and PHP.