Magnet – one of the most popular window manager for Mac.

Every time you resize a window on Mac by hand, you are wasting time. Magnet fixes that. Drag any window to the edge or corner of your screen and it snaps into place — halves, thirds, quarters, or fullscreen. You can also use keyboard shortcuts if you prefer to keep your hands off the mouse.

Key Features:

• Drag to Snap: Drag any window to the edge or corner of your screen to snap it into halves, thirds, or quarters.
• Keyboard Shortcuts: Use customizable shortcuts to arrange windows without touching the mouse.
• Menu Bar Access: Quickly trigger any window layout from the menu bar icon.
• Multiple Display Support: Supports up to six external displays for larger workspaces.
• Custom Layouts: Create your own window size and position commands beyond the built-in presets.
• iCloud Sync: Sync your shortcuts and preferences across multiple Macs.
• One-Time Purchase: No subscription, no in-app purchases — pay once and own it.