Those (like me) on the market for an used car will certainly appreciate this... it claims to be portable (untested!) and includes a lot of info on particular makes, using the eXtensible Car Description
Car Explorer makes easy to harness knowledge about car markets in the well-structured, granular, and perceptible way. Due to this organization of data in downloadable CAR files the analysis of car markets has never been easier.
Download @ http://www.carexplorer.org/