If you cannot find a free license key for UUByte, several robust, free, and open-source tools can handle ISO tasks on macOS. Pros: 100% Free, no installation, highly reliable. Cons: Requires technical knowledge of command-line tools.
If you want a "portable" feel, Ventoy allows you to just drag and drop multiple ISO files onto a USB drive and boot from them directly. Disk Utility: uubyte iso editor free license key mac portable
What are you currently using? (Intel-based or Apple Silicon M1/M2/M3?) If you cannot find a free license key
: Automatically splits large install.wim files (over 4GB) to bypass FAT32 file system limitations. uubyte iso editor free license key mac portable
For basic mounting and burning, the native Disk Utility (found in your Applications/Utilities folder) handles many ISO tasks without extra software.