Barcodepedia is a community based online barcode database. The database is completely free to use, and everyone is welcome to contribute. Although it is possible to create a user on Barcodepedia, you can use the entire homepage without one.

Barcodepedia can be used as a barcode scanner using your webcam, just hold the barcode in front of the webcam such that you can see the entire barcode in focus in the preview area and Barcodepedia recognizes the barcode and searches the article in several databases. Link