Apps similar to OmniWM include Hyprland, which is free and open source. Other options are Rectangle, niri, i3 and Loop - Window Management. Window Managers like OmniWM are a crowded field, with more than 25 alternatives for Linux, Mac and Windows.
Fluxbox is a window manager for X that was based on the Blackbox 0.61.1 code. It is very light on resources and easy to handle but yet full of features to make an easy, and extremely fast, desktop experience. It is built using C++ and licensed under the MIT license.
awesome is a highly configurable, next generation framework window manager for X. It is very fast, extensible and licensed under the GNU GPLv2 license.
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.
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The fastest, simplest tiler for KDE Plasma 6+ that gives you full freedom at your fingertip. No need to remember dozens of keyboard shortcuts or be limited by a fixed tile layout.
Wayfire is a 3D Wayland compositor, inspired by Compiz and based on wlroots. It aims to create a customizable, extendable and lightweight environment without sacrificing its appearance.
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IceWM is a Window Manager for X Window System. It is fast and memory-efficient, and it provides many different looks including Windows'95, OS/2 Warp 3,4, Motif.
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.
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ShiftIt is an application for OSX that allows you to quickly manipulate window position and size using keyboard shortcuts. It intends to become a full featured window organizer for OSX. It is a complete rewrite of the original ShiftIt by Aravindkumar Rajendiran which is not...
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