Glyphicons are icon fonts which you can use in your web projects.
Gravatar is a service for providing globally unique avatars.
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.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
XenForo is a PHP-based forum hosting program for communities that is designed to be deployed on a remote web server.