Apache is a free and open-source cross-platform web server software.
jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery, Cascading Style Sheets, and HTML.
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.
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.
SWFObject is an open-source JavaScript library used to embed Adobe Flash content onto web pages.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.