I am interested in an ftdi ft2232H based dongle using openocd. These ftdi chips have an hw usb to jtag/swd converter, I expect this approach to be very simple and robust.
It is however not clear to me how stable openocd's swd support is. But there is always the alternative of using the due's full jtag connector.
I consider this one Bus Blaster - DP. If someone has experience with this dongle or succeeds to use it (or another ftdi based dongle) with the due I'd be happy to know about it.