I was able to locate one to download very quickly on a *** server. Once I downloading it, generating well-formed credit card numbers was a matter of clicking a few buttons. Here are some screen shots from the application I found.....
PS. This application has a number of other functions, including the ability to determine if a known credit card number is well-formed or not."
This is the splash-screen from the credit card generator application.
This dialog box is accessed via a menu command called
"Make New Cards."
By default it will generate 10 Visa card numbers...
... And here are the resulting well-formed Visa card
numbers.
(I've obscured some of the digits for obvious reasons.)