Introduction

As a web engineer and web developer I always wanted to know the technology which were used at a particular site. My personal solution was to dig into the source code and find some specific pattern which tells me that a site is made in Drupal for example. My problem was that it takes time, and I can't recognize every CMS, maybe the just the most common ones. So here are some solutions what I found:

Solutions

1. Manual method 

Detecting the site based on the administrator page.

http://www.seoppcsmm.com/post/86895746/identify-cms-used-in-a-website

2. Builtwith

An incredible site which tells a lot about different sites. It does much more than telling the CMS which was used, it tells basically about the server used libraries etc... Check it out here:  http://builtwith.com

3. Chrome Sniffer

What I use us a chrome plugin called Chrome Sniffer: 

https://chrome.google.com/webstore/detail/homgcnaoacgigpkkljjjekpignblkeae?hl=en

4. Other similar sites

http://onlinewebtool.com/cmsdetector.php

Used image:

http://www.flickr.com/photos/mattfarina/2121449017/