Apps similar to ActiveDock 2 include Rectangle, which is open source with a free version. Other options are RocketDock, ObjectDock, Compiz and DockProfiles. Window Managers like ActiveDock 2 are a crowded field, with more than 100 alternatives for Mac, Windows and Linux.
Slate is a window management application similar to Divvy and SizeUp (except better and free!). Originally written to replace them due to some limitations in how each work, it attempts to overcome them by simply being extremely configurable.
Windownaut is versatile window management app that let's you define keyboard shortcuts and active areas on your screen to resize an position the windows on your desktop.
Easy Move+Resize is based on behavior found in many X11/Linux window managers, adding easy modifier key + mouse drag move and resize to OS X.
Arrange your application windows using nothing but drag and drop! There are no hot-keys to remember or menus to click, just drag and drop a window onto Layout Icon and it will instantly snap to that layout.
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Dock Exposé is a window / task management app for MacOS. It provides previews on the dock using the familiar App Exposé interface (Control+Down Arrow). Trigger another application's (App Exposé) keyboard shortcuts (using Esc and Ctrl+Down-Arrow) to show/hide...
Mosaic allows you to effortlessly resize and re-position windows on your Mac with a simple Drag & Drop, seamlessly integrated into macOS.
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WinNumpad Positioner is a lightweight and snappy Windows management tool that repositions Windows using simple Windows Key + Numpad combinations.
