i3 is a tiling window manager, completely written from scratch. The target platforms are GNU/Linux and BSD operating systems, our code is Free and Open Source Software (FOSS) under the BSD license. i3 is primarily targeted at advanced users and developers.
License: Open Source
Fluxbox is a highly configurable, lightweight window manager with a minimalistic design, ideal for users who prefer simplicity and speed. In contrast, i3 offers dynamic tiling and efficient window management, making it a better choice for power users who need robust functionality and multi-monitor support.