xmonad though it will work with any windowmanger.
detailed usage and scripting instructions.
Set  foreground  color.  The <color> can be specified either as symbolic name (e.g.
red, darkgreen, etc.) or as #rrggbb hex-value (e.g. #ffffaa).
-m     Start up in menu mode (see (3) in README).
-u     Update contents of title and slave window simultaneously, see (see (4) in README).
manpage falls under the same licence as Dzen2 itself, see /usr/share/doc/dzen2/copyright.