[vidyesh]

There are a few other websites which do a similar job with similar issues.

http://www.wpthemedetector.com/

http://scanwp.net/

http://whatwpthemeisthat.com/

All these websites scan and output similar unknown plugins, as it sharing the same database or same method to detect plugins and themes.

http://wpdetective.io/www.pmindia.gov.in

[BorisMelnik]

do you know off hand if any of these are open source?