Apache is a free and open-source cross-platform web server software.
Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.
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.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Pinterest is an image sharing and social media service designed to enable saving and discovery of information.