Fluxbox is a stacking window manager for the X Window System, which started as a fork of Blackbox.
License: Open Source
Fluxbox is a lightweight and highly customizable window manager that is ideal for users who prefer a minimalist design and have older hardware. Openbox, while also lightweight, offers a more user-friendly interface and better integration with various desktop environments, making it suitable for users looking for a balance between customization and usability.