Process RAM

wxHexEditor could open a process memory space at least under Linux.

You need to have enough permissions to do that. (I mean, root)

Devices -> Open Process RAM -> Enter PID -> Click OK

Also you can open the PID with using this command line on start up:

wxHexEditor --pid=<PID>

Not that, this feature just for reading.

Writing into process ram is unreliable under current wxHexEditor versions and not advised to use, but free to try.