The Prosperity Public License
Prosperity is a public
LICENSE for open software that requires users who user your software for commercial purposes to limit their use to a period of days. In other words, Prosperity works for software similar to how Creative Commons' Attribution-NonCommercial License works for other creative work. Software under Prosperity is free for noncommercial use, and offers a free, automatic, honor-system trial to commercial users.
You might choose Prosperity because you've written an application for creating work other than other software, and want to sell business licenses while allowing hobbyists, students, and charities to use for free.