Fluxbox is a stacking window manager for the X Window System, which started as a fork of Blackbox 0.61.1 in 2001, with the same aim to be lightweight. Fluxbox also has several features Blackbox lacks, including tabbed windows and a configurable titlebar.
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Pro Ultra lightweight
Works FAST on any system.
Pro Easy to use and configure
Fluxbox has its own panel, as well as a way to set a wallpaper, which makes it easy to use out of the box. Configuring Fluxbox to one's liking is easily done by simply editing text files.
Pro Simple mouse-driven menus
By simply right-clicking on the desktop, the user can pull up the root menu.
Pro No programming language knowledge required
In order to manage and edit Fluxbox settings and menus, the user does not require programming knowledge.
Pro Large user base and excellent online documentation
Fluxbox has an substantial, active user base, and great online documentation.
Pro Styles (themes) are easy to manage, create, and change
Simple to style and has many styles available. You can also change styles real-time.
Pro Easy key binding
You can quickly and easily bind keyboard events to applications and wm events.
Pro Simple tiling support
Automated tiling is optional and configurable by a simple text file.
Pro Menu can stay visible or hidden for quick access to application launching
The Fluxbox menu system is easily configured to the user's liking, whether they want to keep it hidden or visible.
Pro Window tabbing native shortcut
Pro It's easy to find many new styles and configuration options
Fluxbox has many great themes and config options that are ready for download and installation. In addition to this, there is great documentation on how one can make their own themes or edit their own configs to their liking.
Con Comparatively heavy on system resources
Fluxbox is a bit heavier on system resources when compared to Openbox or other window managers (though it does come with more options as well).
Con No longer supported
Con Requires setup of some configuration files
Con Difficult to master
It does take time to learn the ins and outs of all that can be changed by editing the configs. It can also take some time to finally attain a configuration that is perfect. Many users constantly change and edit their settings, but consider this part of the joy of using Fluxbox.