On / Off 1.2 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This software for Mac OS X is an intellectual property of Raj Kumar Shaw. The application lies within Productivity Tools, more precisely Timekeeping. We recommend checking the downloaded files with any free antivirus.
From the developer:
OnOff will enable you to do many tasks from a simple control panel. The app allows you to control following functions, all from a single elongated dashboard. You can prevent your computer from sleeping, set iTunes On / Off, play iTunes songs, pop up warnings of events, select time to start an app, etc.
You may want to check out more software for Mac, such as iCalMaker, TimeMachineGrowler or BigBen, which might be related to On / Off.