Chen, I have not seen official "databases" like candy stores, just
ready for putting in a coin, and getting a ready solution out, but there
are many big sources for searching articles, books and litterature.
Example:
Chapman Hall / www.chaphall.com
MCB University Press / www.mcb.co.uk
Thomas Register of American Manufacturers and many, many others.
Interesting to see what other answers you will get, Chen.
Regards / Ingemar