Websites using some form of Captcha technology on them.
Anti-bot CAPTCHA widget that helps digitize books by providing snippets of books for people to enter the text for. Owned by Google.
nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
PayPal is a American international e-commerce service that enables companies and individuals to send money and to accept payments without revealing any financial details.
The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.