dmgutil 1.3 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. The software belongs to System Tools. This free software for Mac OS X is an intellectual property of refNum Software. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
dmgutil is an Open Source command line tool for creating, configuring, and compressing Mac OS X disk images for distribution.
dmgutil supports programmatic creation of disk images - allowing you to configure a background image, set window/icon sizes and positions, and apply custom icons prior to compressing the image for release.
You may want to check out more software for Mac, such as NoLimits Pack Extractor, Secret Missions - Mata Hari and the Kaiser's Submarines or One Zipper, which might be similar to dmgutil.