Websites that have a shopping cart or checkout page, either using a known ecommerce platform or a custom solution.
Chosen is a jQuery plugin that makes long, unwieldy select boxes much more user-friendly.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Moment.js is a free and open-source JavaScript library that removes the need to use the native JavaScript Date object directly.
OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.