XustoISO 1.6 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 actual developer of this Mac application is José A. Jiménez Campos. The software lies within System Tools, more precisely File Compression. 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:
XustoISO helps you convert your CD/DVD images into a more reliable format like ISO, DMG, or WAV. The program's interface is simple and intuitive. The supported input formats are displayed on the main window. Therefore, you just need to load the desired CD/DVD image and enable the conversion.
You may want to check out more software for Mac, such as iTar, RAReXtract or YTClock, which might be related to XustoISO.