I use MIDI-OX (free) as a monitor if I need to know what is going on. I guess it is a monitor only showing activity on the MIDI connection, no changes to a Midi File as far as I could see.
I had an editor of sorts back in the days of Steinberg 24 on an Atari. The only thing I could find serching the web that might work as a real editor is midieditor.
Have a look here: https://sourceforge.net/projects/midieditor/
The downloadlink provided is blocked by my virusscaner (certificate invalid).

I was surprised how cumbersome the search for a midi editor/sysex editor is. Seems like there is no need to go bejond the editing capabilities of a piano roll. Hard to belive.


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