SnapIt

Activated by dragging, customizable keyboard shortcuts or via menu bar, Magnet declutters your screen by snapping windows into organized tiles. Having multiple windows aligned neatly side by side eliminates app switching and greatly enhances multitasking. Fullscreen, halves, quarters & thirds. Up to six external displays are supported. The potential combinations are endless. Drag windows to the corners and Magnet snaps them into quarters. Use side edges to arrange horizontal and vertical halves. Dragging to the top edge maximizes window size on a given screen. Bottom edge creates thirds. Slide on it to expand into two-thirds. Quarters and halves reside in the corners and on the bottom edge.

FancyZones is a window manager utility for arranging and snapping windows into efficient layouts to improve the speed of your workflow and restore layouts quickly. FancyZones allows you to define a set of zone locations to be used as targets for Windows on your desktop. When you drag a window into a zone or enter the associated keyboard shortcut, the window is resized and repositioned to fill that zone. You can also trigger zone selection mode by clicking the non-primary mouse button if the "Use non-primary mouse button to toggle zone activation" setting is enabled. If two zones are adjacent, a window can be snapped to the sum of their area (rounded to the minimum rectangle that contains both). When the mouse cursor is near the common edge of two zones, both zones are activated simultaneously, allowing you to drop the window into both zones. You can drag the window until one zone is activated, then press and hold the control key while dragging the window to select multiple zones.