Fluxbox is yet another window manager for X. It's based on the Blackbox 0.61.1 code. Fluxbox looks like Blackbox and handles styles, colors, window placement and similar things exactly like Blackbox (100% theme/style compatibility).
So what's the difference between Fluxbox and Blackbox then? The answer is: LOTS! Here is a list of features that Fluxbox already has, or are in the works...
Configurable window tabs.
Iconbar (for minimized/iconified windows)
Windows/Tabs auto grouping
MouseWheel scroll changes workspace
Configurable titlebar (placement of buttons, new buttons etc.)
KDE and Gnome (including Gnome 2) support
Extended Window Manager Hints (ewmh) support
Native integrated keygrabber (supports emacs like keychains)
Maximize over slit option
Slit dockapp ordering
Fluxbox source can be downloaded from the main Fluxbox site, http://fluxbox.sourceforge.net/. Most Linux distributions and other free Unixes also include source and binary packages of Fluxbox. When in doubt, use your latest distribution packages.
While Fluxbox is pretty easy to use and configure, chances are that at some point questions or problems turn up. A great deal of those have been answered or solved before. Therefore, before you start asking questions on the mailing lists or on the Fluxbox IRC channel, please have a look at the FAQ in Appendix B.