The Window Manager is the layer between X windows and the DesktopEnvironments desktop environment. Window managers (WM) control the placement & appearance of windows. The default in Puppy Slacko is JWM, its very light weight but effective. If you imagine a computer system as a series of layers it would look something like this:

Hardware < Operating System < Display Server/Window System < Window Manager < Desktop Environment

Puppys default is JWM or (OpenBox in Lucid), see the What are JWM and OpenBox? thread.

Hardware < Linux < X X Windows < JWM or OpenBox

(JWM or OpenBox also act as the Desktop Environment, with the help of Puppy scripts and additional programs.)

JWM - default in Puppy4 and Slacko 5.3x, also see JWMElements.

OpenBox - default in Puppy5Index Puppy 5.2x Lucid, not included in Puppy 5.3x Slacko.

OpenBoxExtra - Openbox packaged with Tint, themes and more

Enlightenment - used by MacPup

XFCE - a complete Desktop Environment used by Carolina

Afterstep - based on the look and feel of the NeXTStep interface

Compiz - has special effects

Dwm - minimal tiling wm

Echinus - lightweight tiling wm

Fluxbox - lightweight

IceWM- Easy to use, customizable and good looking window manager.

PekWM - smaller and easier than OpenBox

RatpoisonWM - minimalist with the emphasis on speed

Antico - ANTICO forum thread

Beryl - has special effects

CompizFusion Compiz-Fusion - has special effects

Flwm - Flwm forum thread

HazeWM - super minimal HazeWM forum thread homepage

MLVWM - look and feel like the Macintosh environment homepage

Metisse - has special effects

ProjectLookingGlass Project Looking Glass - has special effects

XFWM - has special effects

JWMElements JWM's elements

WMSwitcher Window Manager Switcher

ChangeWindowManager How to Change Window Manager

WindowManagersEffects Window Managers with Special Effects

DesktopEnvironments Desktop Environments

WikiPedia:Window_manager

List of window managers

Script for Window tiling in openbox (archlinux.org)