Run instant usability studies for your website using your real users. You can get it up & running in seconds with one line of javascript, and immediately watch movies of your users’ browsing sessions to analyze their behavior. Free to start, and if you find it useful, you pay only $0.05 per recorded user.
Quarkbase is a free tool to find complete information about a website. It is a mashup of over 30 data sources and many algorithms gathering information from Internet on various topics like social popularity, traffic, associated people, etc. e.g. http://www.quarkbase.com/show/microbiologybytes.com