A portable drag & drop D64 Disk Image Editor
DiskImagery64 is a portable (Qt 4.2.x-based), open-source D64 disk image editor for Mac, Linux and Windows. It offers a nice GUI with drag-and-drop support between disk images and the local file system. Runs programs or mounts images directly in your favorite emulator. RR-Net support is available and allows to transfer programs and even disk images directly to your real C64.
Download: DiskImagery64 0.7