AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
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.
Linkedin Sign-In is an authentication system that reduces the burden of login for users, by enabling them to sign in with their Linkedin account.
LiteSpeed is a high-scalability web server.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.