sawfish.wm.ext.pager is a C/Lisp extension that provides a functional desktop pager for the sawfish window manager. A pager is a map of your desktop. It shows not only the visible part of your desktop (the current viewport), but also the parts that extend beyond the sides of your screen. Also, if you have more than one workspace, the pager will follow you to where you are, or optionally show all workspaces at once. Of course you can select viewports and windows, and also move or raise/lower the latter.
wmii is the next generation of wmi. It is a highly customizable keyboard-and-mouse-driven X11 window manager that supports conventional, tabbed, and tiled window management with low memory usage and vi-like user interaction. Due to a complete rewrite, it is highly modularized and uses a new configuration and inter-process communication interface, which is oriented on the 9p protocol of the Plan9 operating system.
wmbday is a small dockapp that reminds you of birthdays. It can take an arbitrary number of birthdays, and will display the next four upcoming birthdays. By left-clicking a name, you can see the remaining days until the birthday. The colours of the background and the font can be customised.
Anarchy is a window manager for the X Window System. It is implemented in less than 500 lines of CLOS oriented Scheme code. The implementation language is Gauche Scheme. Despite its small code size, it supports most functions expected of a basic window manager (move, resize, hide, minimize, maximize, list windows, root menu).
FVWM-Crystal aims to create an easy to use, pretty, but also powerful desktop environment for Linux or other Unix-like operating systems. It uses the following programs: FVWM as a window manager and "main core"; different ways to provide icons on the desktop including support for many file managers and custom commands; xterm, aterm, mrxvt, or urxvt as terminal emulators; MPD or XMMS2 as music players (there's built-in support for controlling these programs), and several other tools for different functions, like setting a wallpaper or taking screenshots.
Twindy is a window manager inspired by Tracktion, the multitrack audio editor/sequencer for Windows and OS X. It tries to apply Tracktion's workflow, in which everything is on the screen at once, to a window manager. There are two panels, a main panel in which new windows/programs open by default and may be selected using tabs, and a lower panel, which can only hold one window/program at a time. It uses a modified version of the JUCE library (included), resulting in relatively few dependencies and a fairly unique appearance.