the FLaK website is built on these excellent technologies
Paperclip is intended as an easy file attachment library for ActiveRecord.
Amazon Web Services (AWS) is a secure cloud services platform.
PDF.js is a Portable Document Format (PDF) viewer that is built with HTML5.
blueimp Gallery is a touch-enabled, responsive and customizable image & video gallery, carousel and lightbox, optimized for both mobile and desktop web browsers.