url category database, flat file lists, or API

[joesox at gmail.com (JoeSox)]

Does anyone know of a open source database, flat file lists, or API
that allows me to feed a url and have it return a category
classification
For example, something like this
http://www1.k9webprotection.com/support/check-site-rating

I know of dansguardian but it doesn't have battlefield.com as a game
site and is more of a blacklist.
I thought I saw one a few years back but it was only for linux but
still had categories.
--
Thanks, Joe