Open source macOS window snapping with a pop-up grid: drag across cells to place windows, then save regions as one-keystroke presets, a free Divvy alternative https://alternativeto.net/software/gridsnap-for-macos/about/
AlternativeToGridSnap for macOS: An open source alternative to Divvy for macOSAn open source alternative to Divvy for macOS. Press a shortcut, a grid appears, drag across the cells you want, and the window snaps there. Save a region as a preset and it becomes a one-keystroke snap.