BetterTouchTool is a great, feature packed app that allows you to configure many gestures for your Magic Mouse (1 & 2), Macbook Trackpad and Magic Trackpad (1 & 2) and also Mouse Gestures for normal mice.

Too many windows on your screen? Stop wasting your productivity. AquaSnap brings new easy and efficient ways to manage multiple applications.

SmartSystemMenu extends system menu of all windows in the system. It appends next custom items to menu:

Divvy is an entirely new way of managing your workspace. It allows you to quickly and efficiently "divvy up" your screen into exact portions.

AltDrag allows you to move and resize windows much easier. When you have it running you can simply hold down the Alt key and then use your mouse to drag any window, and it doesn't matter where in the window you click.

WindowGrid is a modern window management program that allows the user to quickly and easily layout their windows on a dynamic grid.

Moom makes window management as easy as clicking a mouse button—or using a keyboard shortcut, if you're one of those types of people.

Allows almost any program to be minimized to the system tray by right clicking its minimize button.

allSnap is a small system tray app that makes all top level windows automatically align like they do in programs such as Winamp or Photoshop.

Total Windows® Facelift!.

Amethyst is a tiling window manager for Mac similar to the xmonad tiling window manager popular on Linux. Amethyst is written in Objective-C and has configurable shortcuts, multi-monitor support, multiple layouts, and the option to float certain applications.

yabai started as a C99 rewrite of chunkwm, originally supposed to be its first RC version.