QR is an open standard. You can find QR code generators online. For example: This one from Kaywa.

Marshall,

I worked on a campaign for CES that used QR codes and developing tracking for them isn’t always a simple exercise. The code gets more complex (higher data resolution) with the amount of data within it, so longer URL’s (such as those that have been tagged for analytics) produce QR codes that are more difficult to machine read. Also, you can’t use url shorteners because of differing support for redirects within mobile browsers. Also, you (obviously) need to account for mobile browsers in your landing pages.