Correctly handles many SGF files that trouble other GUIs, especially handicaps and mid-game board edits.
No dependencies except Electron, quite easy to run from source, doesn't pull in a zillion npm modules.
Downsides
KataGo not included, setup takes at least a minute's effort.
Not really a full SGF editor (cannot write comments or edit player names yet).
Electron-based app, everyone hates these (they're big).
Performance tips
The setting to request per-move ownership info from KataGo (see Analysis menu) is rather demanding and you should turn it off if you experience any lag.
Alternatively, consider changing the engine report rate (see Misc menu) from the default 0.1 (which is the most intense) to something else.