Fvwm is a very famous window manager for X, which provides a virtual/multiple disjoint desktop, a 3-D look for windows decorations, shaped/color icons. It gives a very good emulation of mwm. A nice button-bar can be used to provide convenient access to frequently used functions or programs. See http://www.fvwm.org/, the official FVWM home page. This packages also employs I18N_MB patch, to add internationalized features; use multibyte characters in titlebar, icon name, etc.