DisplayFusion, BetterTouchTool, Windy, Spectacle, AquaSnap, BetterSnapTool, Divvy, SizeUp, HyperDock, Zones for Mac, Cinch, Display Maid, ActiveDock, WindowGrid, Shiftit, Chameleon Window Manager, KDE Mover-Sizer, FancyWM, Fluid Navigation Gestures, altdrag, Mosaic Window Manager, VEEER, Taekwindow, Light Pillar Mosaic, SMBAct, Tuck, Amethyst Windows, Deskovery, WindowTidy, Mjolnir, gTile, Flexiglass, yabai, Easy Move+Resize, Snap Assist, MoveInactiveWin, Windownaut, Stack WM, MaxSnap, chunkwm, Window Collage, iSnap, WinNumpad Position, Better Window Manager, Cisdem WindowManager, TileWindows, Keypad Layout, DoublePane are some alternatives to Rectangle.