PageXray

This extension will give you a one-click access to find-out the technologies used on the current page that you are visiting.
It can also create a list of icons on the footer, you need to activate this on the options page.
This app can scan upto 300+ technologies by using the extension.

F.A.Q.

Unlike other extensions, this app doesn't slow your page browsing.
Some users reports that Wappalyzer, Chrome Sniffer, etc uses a lot of CPU;