This MicroPython WBUS-DIP68 connector board can be used for all pyboard D variants and gives access to all power and IO pins. In addition to the pyboard, it can also carry up to four 20-pin mezzanine bus tiles.
There are different tiles available, like: TILE-SENSA and TILE-LED36.
It's possible to solder 2x34 headers to the WBUS-DIP68 and plug it directly into a breadboard or similar. This gives you direct access to all the GPIOs on the pyboard D.
Learn more about how to use the WBUS-DIP28 here.