Apache is a free and open-source cross-platform web server software.
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.
Modernizr is a JavaScript library that detects the features available in a user's browser.
reCAPTCHA is a free service from Google that helps protect websites from spam and abuse.
SPIP is a content management system written in PHP that uses one or more databases like SQL, SQLite or PostgreSQL.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.