For one program I wrote, I released it as Freeware and asked for satisfied users to send me a postcard. It wasn't a very big or useful program, and I didn't widely publicise it, but I was surprised and pleased to receive a postcard from New Zealand saying "thank you"!
It's a nice, simple and probably unexpected way of showing appreciation for a little program.
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It's a nice, simple and probably unexpected way of showing appreciation for a little program.