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DiskImagery64 is a portable (Qt-based), open-source disk image editor for Commodore 64 disk images running on Mac, Linux and Windows. It offers a nice GUI with drag-and-drop support between disk images, the local file system and real retro hardware.
You can download file releases of DiskImagery64 project from List of release files
System RequirementsOperating System: MacOSX, Linux, Windows XP
List of release files