I released on Github a open source library written in PHP for detecting various CMS's.

I felt like there wasn't really any open source tool for this so I made this.

Currently it only detects Drupal, WordPress and Joomla! websites. I am working on other CMS's and versioning support.

If you want to contribute, feel free to do so! :) I especially need help to detect lesser-known CMS's and frameworks.