If you are looking for a free way to create bootable USBs on a Mac without needing a license key, these tools are widely trusted by the community:
: Although designed for Raspberry Pi, it can flash various OS images to external drives reliably. step-by-step guide Wonderiso License Key Mac Fixed
For many basic ISO tasks, like creating a disk image or burning to a physical disc (if you have a drive), the native Disk Utility is the safest and most reliable tool. If you are looking for a free way
: A free, open-source tool specifically designed for creating Windows bootable USBs on macOS. Wonderiso License Key Mac Fixed