Fluxbox is a windowmanager for X. It's based on the Blackbox 0.61.1 code. Fluxbox looks like blackbox and handles styles, colors, window placement and similar thing exactly like blackbox (100% theme/style compability).
Documentation can be found on the official site here.
KDE Plasma is a powerful free software graphical desktop environment for Linux and Unix workstations. It combines ease of use, contemporary functionality, and outstanding graphical design with the technological superiority of the Unix operating system.
To download KDE Plasma, please see KDE's Distributions Page.
To view different KDE applications, please see KDE's Applications Page.
XFCE embodies the traditional UNIX philosophy of modularity and re-usability. It consists of a number of components that together provide the full functionality of the desktop environment. They are packaged separately and you can pick and choose from the available packages to create the best personal working environment.
To get the latest version of XFCE, please go to the XFCE download page on the provider's website.