The 1.0.4 version of PiWriter for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is an intellectual property of Arjan van Lent.
This program's bundle is identified as org.adjemin.PiWriter. The most popular version of the application is 1.0. This free program was developed to work on Mac OS X 10.4 or later. Piwriter-1.0.1-universal.dmg is the most common filename for this app's installer. We recommend checking the downloaded files with any free antivirus. The software belongs to System Tools.
From the developer:
PiWriter is a tool to help you make bootable SD-cards for your RaspberryPi in Mac OS X. But it's not limited to just RaspberryPi; you can use it to copy every bootable .img file to both internal and removable disks.
The Universal DMG works for both PowerPC and Intel systems and runs on all OS versions supporting Cocoa.
You may want to check out more software for Mac, such as Synchronize! X Plus, Folder Backup or PHOTORECOVERY, which might be similar to PiWriter.