FLWM

The Fast Light Window Manager is an X [window manager] that is based on FLTK. FLWM is the default window manager for Tiny Core Linux. FLWM was influenced by WM2.

WWW Official Site

Features

Features of the FLWM window manager include:

Small
Window decorations include borders and a vertical titlebar
sloppy focus with click to focus
Multiple desktops
Desktop switching via menu or by using the keyboard
No support for themes. Colors are customizable via command line arguments.