An 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.
Or download GridSnap-x.y.z.zip from the latest release, unzip it and drag GridSnap to Applications.
On first launch GridSnap asks for Accessibility, which it needs to move other apps' windows. Turn it on under System Settings › Privacy & Security › Accessibility (the menu bar icon has a Grant Accessibility… item that opens that pane). GridSnap picks the grant up on its own, no relaunch needed.
The grid appears on the display under the cursor and the window snaps to that display, so moving the mouse to another monitor before pressing the shortcut moves the window there. Presets snap to the display the window is already on.
