QuarkBase is a free online tool that you can use to find information about a website. It’s a mashup of over 30 data sources and many algorithms gathering information from Internet on various topics like social popularity, traffic, associated people, etc.
It’s a great tool if you want to know more about a website without going from page to page to gather information. You can easily find out which framework the website is using and where it is hosted. Other useful information is also available such as description and contact information. You can also use QuarkBase to look for similar and related sites to the one you are viewing. It’s also great for viewing the number of Feedburner subscribers if the owner chooses not to show it in his/her blog.
There a many services that you can use to get information about a website and QuarkBase is just one of them. You might also want to check out Cubestat which estimates a website’s worth and shows other information about that website plus a traffic ranking other than Alexa.