Rectangle is a free, open-source app for moving and resizing windows on a Mac. It's for anyone who wants quick halves, thirds and corners without dragging window edges around.

Key features:

Move and resize windows with keyboard shortcuts.
Repeat a shortcut to cycle through different window sizes.
Drag windows to screen edges and corners to snap them into place.
Use snap layouts on portrait displays too.
Pick Spectacle's default shortcuts on first launch if you're switching from that app.

Rectangle supports macOS 14 and later. A separate Rectangle Pro app adds quicker snapping and custom shortcuts for any size and position, with a 10-day free trial and a US$9.99 purchase.