Off 2.15.4 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The most popular versions of the tool 2.2, 2.1 and 1.1. This free software is an intellectual property of Mark Bridges.
The software belongs to System Utilities. Off.exe or Off1.1.exe are the default file names to indicate this program's installer. You can launch Off on Windows XP/Vista/7/8/10/11 32-bit. We recommend checking the downloaded files with any free antivirus.
From the developer:
Off is a free program that makes it easy to turn off or restart any computer on your network from your iPhone/iPad. All you have to do is to open the application, select the computer you wish to turn off and pick either restart, shut down or shut down in an hour.
You may want to check out more software, such as Multiplicity, Bitvise WinSSHD or Remote Control Pro, which might be related to Off.