Updated: 12/29/2005
Shell
!!Shells
Other shell sites: [Report a dead link]

Blackbox for Windows
Minimalistic shell replacement. [Report a dead link]
http://desktopian.org/bb/

Bluebox
Window manager for Windows. Ported from Blackbox for Linux. [Report a dead link]
http://bluebox.lokai.net/software.html

Cloud9ine
A good shell replacement for beginners. Written in VB. [Report a dead link]
http://www.cloud9ine.com

Core
Basic skinnable shell for Win32 systems. Can also plug in modules from third parties. Also at http://home.student.uu.se/c/cace4851/core/core.php3 [Report a dead link]
http://www.coreshell.info

Fastell
Shell replacement with skins. [Report a dead link]
http://www.htk.fi/public/akirjavainen/

Geoshell 4.7
Shell replacement for Win 9x/NT/2000. [Report a dead link]
http://www.geoshellx.com/

Google Windows Shells
[Report a dead link]
http://directory.google.com/Top/Computers/Software/ Operating_Systems/Windows/Alternate_Shells/

Indie Litestep
An opensource Litestep shell? [Report a dead link]
http://indiestep.sourceforge.net/

Litestep
Another skinnable shell. Looks like it skins all parts if you want it to: taskbar, taskbar menus, titlebar, scrollbars, control buttons (close, minimize, max, etc.) and more. Lots o docs, looks good. For Win 9x, NT, 2000. Also at Litestep.org. [Report a dead link]
http://www.litestep.com

LSBasic , 2,700kb
A basic distrobution of Litestep. [Report a dead link]
http://westep.shellscape.org/lsbasic.html

Openvision
A shell replacement for win95/98/nt/2000. Not just a replacement for Explorer, but for the whole desktop environment. [Report a dead link]
http://openvision.50megs.com

Openvision (WIP)
A Windows shell replacement still being worked on. [Report a dead link]
http://207.253.56.34/OpenVision/index.html

Sharpe shell
Skinnable shell with plugins. Also at http://www.lowdimension.net [Report a dead link]
http://sharpened.shellscape.org/index.php

Shell Shocked
Windows shell magazine. [Report a dead link]
http://shell-shocked.org