I use https://rectangleapp.com/pro and really enjoy this app (I paid for it, it gets a lot of updates/fixes). It mostly takes care of snapping and resizing windows with hot keys, but has a less obvious feature in preferences to use mouse. My setup is: CMD+SHIFT will move any window under mouse pointer CMD+SHIFT+CTRL will resize any window under mouse pointer
It’s a paid app too, but it was worth every cent. The app was updated for free since my first purchase ten years ago!