Inkjet Plumber is an application for the Mac that allows you to send a small print job to one or more of your printers at an interval of your choosing. It was written with infrequent inkjet users in mind, allowing you to automatically send a small print job to an otherwise idle inkjet printer.
I make no claims that Inkjet Plumber will prevent clogs or reduce your ink costs, however, it's generally accepted by many people that it's best to exercise your inkjet printer rather than leave idle (or powered off) for long periods of time.
Many Windows users use QImage for this purpose, however, QImage only runs on Windows and I was not able to find a comparable application for the Mac.
Inkjet Plumber is written in C++ using the Qt Framework and built for the Mac OSX operating system. While the Qt Framework is very portable, I do not have access to any Windows systems, so I can only provide an executable build for the Mac operating system at this time.
You may download binary releases (dmg file) of Inkjet Plumber from here. Inkjet Plumber also provides auto-update functionality to make sure you stay up-to-date with the development of Inkjet Plumber.