The website he linked is the official and I fully support them. I’d add that you can access nearly anything a dealer can diagnosis or do to your car with vagcom including flashing the ecu and changing almost any software setting - disable abs, turn off airbags... not recommended, swap from NA settings to ROW settings etc. not just the simple stuff like make your horn beep 3 times when it unlocks or roll down your windows with your key fob.
Also you can find used cables floating around pretty frequently. Older versions are VIN unlimited but the newer ones are more updated for newer models therefore more expensive. I have a hexcan cable that’s a few years old and it’s been fine for me.
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