Download of PowerSwitch 1.2 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The software lies within System Tools, more precisely Dashboard Widgets. We recommend checking the downloaded files with any free antivirus. This free Mac application is a product of PlatkusWorld Software.
From the developer:
PowerSwitch widget lets you sleep, log out, restart or shut down your system immediately or after a delay that you specify. It can also close all Finder windows, empty the Trash and secure your system at the same time. All with a single click on the PowerSwitch! New for Lion, PowerSwitch can control whether open applications are restored or not upon the next log in.
You may want to check out more software for Mac, such as PowerSwitchWatchdog or SwitchClient, which might be related to PowerSwitch.