careware
(CAYR.wayr) n. Computer software in which the only “price“ is to do a good deed or donate something to charity.

Example Citation:
Do you need to design a Web site? Microsoft's FrontPage is a very capable program, but the 2002 version lists for $ 169.

Instead, try Arachnophilia (www.arachnoid.com/arachnophilia). This is a nicely featured program and is "careware." The author wants no money at all for his program. Instead, he asks that you "stop whining for an hour, a day, a week, your choice, and you will have earned your copy of Arachnophilia." That's not a bad deal at all.
—Kim Komando, "Programs you can download for free," Gannett News Service, April 1, 2002

Earliest Citation:
The software is free, but if you'd care to, stuff a dollar bill in the mailer for the Brevard County Food Bank. They help the homeless and hungry. We call it DDJ's "careware" program.
—Al Stevens, "Software Development '92 and D-Flat dialog boxes," Dr. Dobb's Journal of Software Tools, June 1992

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