ctrlwm is described as 'Ctrlwm is a customisable tool for automatic windows positioning and sizing (e.g. tiling, resizing like Windows Aero Snap, and much more). It can be driven through either command line or screen corner/border actions (see daemon mode)' and is an app in the OS & Utilities category. There are eight alternatives to ctrlwm for Windows, Linux, BSD, PortableApps.com and X11. The best alternative is GridMove, which is both free and Open Source. Other great apps like ctrlwm are KDE Mover-Sizer (Free, Open Source), KWin (Free, Open Source), QuickTile (Free, Open Source) and reSizer (Free).
KDE Mover-Sizer is a lightweight program enabling KDE-style alt-click moving and resizing for Windows XP, 7, 2000, 2003, Windows Server, and Vista. It is a background application that emulates the behaviour of KDE, which is a rather good Linux desktop environment.
KWin is a window manager for the X Window System, and is in the process of becoming a Wayland compositor. It is an integral part, and the default window manager of the Plasma Workspaces, but it can also be used on its own or with other desktop environments.
reSizer is a system utility that enables keyboard shortcuts to focus, move, resize and change other window properties in a fast and intuitive way without even touching the mouse. Features: Keyboard shortcuts for moving and resizing active windows.
Plumb is designed to reduce the time spent manually moving windows on your desktop. With higher resolution and larger monitors becoming the norm it’s common to have several applications open at any given time — none of which really need 100% of the screen.
PyGrid is a small utility which allows you to easily organize your open windows by tiling, resizing and positioning them to make the best use of your desktop real estate. It's easy to configure and supports multiple monitors.