Code Dumper
Same interface as because I was lazy.
Screenshot:
https://i.ibb.co/H7tvzwX/Screenshot-2019-05-21-at-3.png
Can generate PSN codes, XBOX codes, Discord Nitro codes, Geforce now codes, whatever you can think of!
Link:
http://sitesgithub.github.io/code/
It's also opensource.