HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
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.
Lighttpd is an open-source web server optimised for speed-critical environment.
PayPal is an online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.
Redmine is a free and open-source, web-based project management and issue tracking tool.
Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.