This is my new project: https://www.hackster.io/gniibe/bbg-swd-93bcea

Background: I develop a board for Gnuk, that's FST-01.

Until today, I have to say "please use some JTAG/SWD programmer", although most programmers have proprietary firmware.

Now, with BBG-SWD, I can ask manufacturer to use this tool. This is huge benefit (for me) to ensure no questionable bit will be on FST-01 in the manufacturing process.