What does HackerNews think of vidcutter?
A modern yet simple multi-platform video cutter and joiner.
Language:
Python
Not sure exactly what your use case is, but I use vidcutter for lossless clip extraction and it works great and does not require Electron (it's QT based I believe). https://github.com/ozmartian/vidcutter
To answer a point that's been brought up elsewhere in the thread, one nice feature of vidcutter is that you can either cut fully losslessly (on keyframes) or cut frame-perfect while only encoding the frames before and after the first and last keyframes in the cut.
The Arch Linux package for vidcutter is only 4 MB. It has dependencies, of course, but I already have all of them installed for other things. (There's nothing uncommon.) All praise to dynamic linking.
Vidcutter seems simple
https://github.com/ozmartian/vidcutter
There is an interesting GUI tool that is supposed to allow you to do this with frame accuracy by re-encoding the section of the cut video before the first keyframe, and merging it with the losslessly copied section. However unfortunately in practice I have found it so unreliable as to be useless. I wonder if there is a similar better tool for this.