Sven wrote:

Cool. This is really the 'Just doit' spirit !

If one has a good description/specification as found here http://barcode-coder.com/en/ean-13-specification-102.html one just has to write some unit tests and make them green ;) Sven wrote

Next, generating QR codes ;-)

not yet - but beside EAN13 there is now EAN8 as well Bye T.