Postcardware, also called just cardware, is a style of software distribution similar to
shareware, distributed by the author on the condition that users send the author a postcard.
This is similar to
beerware. A variation, Emailware, uses the same approach but requires the user to send the author an
Postcardware, like other "novelty" software distribution terms, is often not strictly enforced.
The concept was first used by
Aaron Giles, author of JPEGView.cite web|url=http://aarongiles.com/history/index.html |title=Aaron's Computing History |accessdate=2006-08-07 |accessmonthday= |accessyear= |author= |last=Giles |first=Aaron |authorlink=Aaron Giles |coauthors= |date= |year= |month= |format= |work= |publisher= |pages= |language= |archiveurl= |archivedate=] Another well-known piece of postcardware is the roguelikegame " Ancient Domains of Mystery", whose author collects postcards from around the world. Orbitron is distributed as postcardware. Exiferis a popular application among digital photographers that is "postcardware". Caledos Automatic Wallpaper Changer is a "still alive" project cardware. Linuxwas postcardware for a long time as well. [cite book|last=Torvalds|first=Linus|authorlink=Linus Torvalds|title=Just for Fun|publisher=HarperCollins Publishers|location=New York|isbn=0-06-662072-4]
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