Idlau is a free and simple to use OS X app that will launch the apps you added to "Login Items" when your Mac is idle.
Launching conditions can be set as: · Certain period of time without user inputs. · Certain period of time with CPU load under certain value. · Certain period of time elapsed from login.
Idlau also features an Import from "Login Items" menu to import your apps from "Login Items" into Idlau`s list.