A very good news for the new year,
BlackMagic has been ported to Hydrabus and is fully working with JTAG & SWD.
(Tested JTAG/SWD debugging on target STM32F4 & LPC4330)

For more details see:
https://github.com/bvernoux/blackmagic
https://github.com/bvernoux/blackmagic/tree/master/src/platforms/hydrabus