dfu-util is a host side implementation of the DFU 1.0 and DFU 1.1 specifications of the USB forum. DFU is intended to download and upload firmware to/from devices connected over USB.
Ddr-Z8E is a device driver library for the Zilog Z8 Encore!(r) microcontroller. The library supports I/O, IRQ, RS-232, I2C, SPI, A/D, WDT, ticker and built in flash memory as well as utility modules, e.g. for debugging and binary number representation.