Dump of Mifare classic keys to use within Flipper Zero. Read the installation guide.
TTC Card Key dump. Not everything could be bruteforced.
(Context: TTC is a russian public transport service in Tyumen Region which uses MF classic to authenticate)
Keygen. Random assortment of letters and numbers. Takes a lot of time to unlock (over a day maybe). Unknown chance of card unlock. You probably should use something like RogueMaster if you need to read any card.
I don't have any exactly. All of the NFC cards around me authenticate via UID. If you can, you can open a PR with keys you personally found.