I was about to recommend VueScan which I purchased once way back in 2004 and have used ever since using the same license, but I was disappointed to learn that they have now moved to a subscription model (guess my perpetual license got grandfathered in). How disappointing!
This motivated me to check another perpetual license I've had for a while -- MediaMonkey (license bought in 2006). Looks like this is still available as a lifetime license!
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