A software product whose author requests as payment a postcard from the user's hometown.(noun)
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Use "postcardware" in a sentence
"And in order to make sure that those who can't afford the bidding aren't shut out, he's also giving away the chance to be a character in his next book as a piece of postcardware:"
"That guy could make a lot of money with that program, but it's only postcardware."
"A simple to use wizard will guide you through the freeware/postcardware program."