Enlightenment
- A window manager based on Enlightenment Foundation Libraries.
- http://www.enlightenment.org/

ROX Desktop
- A desktop environment with some features of RISC OS.
- http://rox.sourceforge.net/

XD640
- A lightweight graphical desktop environment for X-Window designed for older computers running at 640x480 screen resolution.
- http://www.oksidizer.com/software/xd640.html

JD4X
- A basic GUI windowing environment developed to support the Java programming language based on top of the X window system.
- http://jdx.sourceforge.net/

Openbox
- A standards compliant light-weight extensible window manager.
- http://icculus.org/openbox/

BadWM
- A minimalistic window manager for the X Window System.
- http://badwm.sourceforge.net/

The Stump Window Manager
- A tiling, keyboard driven X11 Window Manager written entirely in Common Lisp.
- http://www.nongnu.org/stumpwm/

Ratpoison Window Manager
- A simple Window Manager with no fat library dependencies, no fancy graphics, no window decorations.
- http://ratpoison.sourceforge.net/

Evilwm
- A minimalist Window Manager for the X Window System.
- http://evilwm.sourceforge.net/

VTWM
- A virtual window manager for the X Window System. It is based on twm, and can be used just like twm. It provides multiple virtual screens, a 3D look, and lots of neat features.
- http://www.kolumbus.fi/jtp/personal/vtwm/

Generic Window Manager Manual
- GWM is an X window manager you can program using LISP.
- http://tronche.com/gui/x/gwm/html-manual/

Open Look Virtual Window Manager
- Based on olwm. Allows large virtual desktops.
- http://www.plig.org/xwinman/olvwm.html

Oroborus
- A very minimalistic, but still fully configurable windowmanager.
- http://www.oroborus.org/

pekwm
- A good looking but lean windowmanager with support for dockapps, tabbed windows, automatic window manipulation, dynamic menus, key sequences.
- http://pekwm.org/

AfterStep Applets
- Home of the distribution of applications for the AfterStep window manager.
- http://www.tigr.net/afterstep/

WindowLab
- A small and simple window manager of novel design.
- http://www.nickgravgaard.com/windowlab/

FluxBox
- A fast compact window manager based on the Blackbox, but offering more features.
- http://fluxbox.sourceforge.net/

PWM
- Lightweight window manager for X11 that lets multiple client windows attach to the same frame.
- http://modeemi.cs.tut.fi/~tuomov/pwm/

Ion
- Text-editorish, keyboard friendly window manager.
- http://modeemi.cs.tut.fi/~tuomov/ion/

Sawfish
- An extensible window manager using a Lisp-based scripting language. All window decorations are configurable and all user-interface policy is controlled through the extension language. This is no layer on top of twm, but a wholly new architecture.
- http://sawmill.sourceforge.net/

mlvwm
- Macintosh Like Virtual Window Manager.
- http://www2u.biglobe.ne.jp/~y-miyata/mlvwm.html

Blackbox
- Light window manager, without all those annoying library dependencies.
- http://blackboxwm.sourceforge.net/

Small Window Manager
- Minimal window manager intended for use with small screen sizes.
- http://www.small-window-manager.de/

Pie Menu Window Manager
- Minimal window manager that uses pie menus.
- http://www.crynwr.com/piewm/

Fast Light Window Manager
- Derived from wm2. Source code and binaries available.
- http://flwm.sourceforge.net/

aewm
- A minimalistic X11 window manager.
- http://www.red-bean.com/~decklin/aewm/

Official AfterStep Development site
- Site dedicated to Development of the AfterStep Window Manager. Includes HTMLized sources, daily activity log, and TODOs.
- http://afterstep.sourceforge.net/

The Mlvwm + Kfm Site
- How to create a mac-like desktop in linux.
- http://dimensional.com/~ds55/

LinuxPlanet Window Managers Page
- Reviews of, and tutorials on, window managers under Linux, for beginners.
- http://www.linuxplanet.com/linuxplanet/subjects/432/

The Scheme Configurable (Constraints?) Window Manager
- A highly configurable X Window manager written and configurable with Guile Scheme. An absolute must for any hardcore Schemer who uses X Window. Now at version 0.99.6.1 with Gnome support, a CORBA interface, a complex constraint system for pseudointellig
- http://scwm.sourceforge.net/

Window Manager Icons Distribution
- a project to provide an efficient configurable icon distribution
- http://wm-icons.sourceforge.net/

GNUstep.org
- Official site of GNUstep: free implementation of NeXTStep/OpenStep specification.
- http://www.gnustep.org/

wmx
- wmx is also a window manager. Home page quote : "wmx is a window manager for X. It's based on wm2, and it retains a similar look and feel, but it's intended to provide an experimental vehicle for features that fall comfortably outside the scope of t
- http://www.all-day-breakfast.com/wmx/

wm2
- Really minimal window manager
- http://www.all-day-breakfast.com/wm2/

amiwm
- X window manager that tries to look and feel like Amiga Workbench.
- http://www.lysator.liu.se/~marcus/amiwm.html

The Official AfterStep Site
- NeXTStep-like windowmanager
- http://www.afterstep.org/