From https://news.ycombinator.com/item?id=35710350 :

> ... py-list, py-up and py-down, py-bt, py-print, and py-locals GDB commands

> [ DDD, pyclewn (vim), trepan3k, Voltron, gdbghidra ]

gdbghidra: https://github.com/Comsecuris/gdbghidra

radare2: https://github.com/radareorg/radare2

voltron: https://github.com/snare/voltron

And from https://news.ycombinator.com/item?id=41943521 :

> pyvmidbg (libVMI + GDB)

But that's archived.

There's a QEMU gdbstub GDB interface.

To print registers with GDB:

  info reg
  info all-registers
  i r a