Remote Shutdown
RemoteShutdown allows an NT/2K/XP Administrator to remotely shutdown any number of NT/2K/XP Workstations over which they have administrative control via either a GUI interface or a command-line interface. You can specify a delay, which can either be an absolute time (eg. ... Whilst a delayed remote shutdown is taking place, you can abort the shutdown of any or all of the workstations on the shutdown list. ... You can also perform a delayed shutdown of your own (local) machine, with optional support for APM power-off Options can be set via both a GUI and a command-line interface.
http://www.coruscant.ltd.uk/files/RemSht33.exe - 291Kb - Download - Screenshot

Multi-Remote Shutdown Manager
Multi-Remote Shutdown Manager is an easy and screamingly fast way to shutdown the computers you administer. It is designed for network administrators working with groups of systems. Options include Shutdown, Restart, Set Countdown, Send Message, Force Apps to Close, Force Reboot and Abort... Tops. ... 1000 computers -- 5 minutes.
http://www.eytcheson.com/download.htm - 641Kb - Download - Screenshot

EugeneShutdown
EugeneShutdown is a system utility for Windows 9x/ME/NT/2000/XP operating systems that allows to automatically shutdown, power off, reboot or log off current user at a specific time on your local computer and initiate shutdown of remote computer. The program provides the following key features:...
http://www.eugenesoft.com/downloads/EugeneShutdown.exe - 642Kb - Download - Screenshot

DShutdown
DShutdown (Dimio's Shutdown) is a stand-alone program that let you schedule the shutdown of a local or remote PC. He supports, beyond classical shutdown options, also a series of particular options relating pure shutdown (as the ForceAfterWait option, that causes a forced, but clear, shutdown),... Is also possible to intercept a shutdown request caused by the user (or by another software) and to execute the shutdown request with selected options in DShutdown (this can be useful, for example, to shutdown all LAN's PCs at the shutdown of a server).
http://digilander.libero.it/dimio/dshutdown.zip - 200Kb - Download - Screenshot

PowerControl
This program quickly and simply will allow you to make Shutdown, Reboot, Hibrnete, Logoff, Standby, Lock the local or removed computer (or several computers). As you may may awake the removed computer with the help of function Wake-On-LAN. You can specify a delay, which can either be an absolute... Whilst a delayed remote shutdown is taking place, you can abort the shutdown of any or all of the workstations on the shutdown list. ... Applications running on the target machine(s) at the time of shutdown can be allowed to close, or can be terminated immediately.
http://www.onlimemedia.com/download/powercontrol_setup.exe - 1Mb - Download - Screenshot

Remote task manager
Remote task manager needs no installation, just unzip it to some folder and start it. With this program you can kill remote process, shutdown remote computer, change remote computers domain, view system information of remote computer, send message (works if you have messenger service... It requires no installation on remote machine!
http://www.filelodge.com/files/hdd5/102748/demo_v1_3.zip - 932Kb - Download - Screenshot

RebootEx
RebootEx is a system utility for Windows NT/2000/XP operating systems that allows to automatically shutdown, reboot and/or relogon to your computer. The program provides the following key features: ability to reboot, shutdown, shutdown & power off the computer, log off the current user,... A number of additional command line options makes it a highly scriptable efficient and secure tool.
http://www.ashkon.com/download/rebootex2.exe - 477Kb - Download - Screenshot

RSHUT PRO
RSHUT may do all your daily work concerning computer power management. Use this to shutdown/reboot your computer or remote computers over your network/Internet instantly,schedule your actions. Supports password protection and many additional features. ... You'll can shutdown,reboot remote computers from the server seat, execute remote commands, schedule any your actions and more. ... Are you have to shutdown many computers at the same time daily? ... RSHUT Pro supports ATX and Wake-On-Lan technology with your computers,so it can powered off and turn on them back whenever it require.
http://www.rtsecurity.com/rshut.zip - 594Kb - Download - Screenshot

ShutDownOne
ShutDownOne runs in the system tray and allows you to quickly shut down Windows. You can choose from a full shutdown, reboot, log off, power off and also lock the work station, activate hibernate. Any operation can be executed as an emergency (force) shut down. ... ShutDownOne also allows you to perform remote shutdowns for machines on the network and supports commandline operation, as well as creation of batch files for any selected action. ... Additional features include custom commands before execution, optional user warning and password protection, auto-login after Restart, deleting a...
http://www.dimaware.com/downloads/shutdown.zip - 295Kb - Download - Screenshot

RemShutdown
RemShutdown allows remotely shutdown or restart network computers. You can specify a delay during which a message you specify can be displayed and applications running on the remote computer at the time of shutdown can be allowed to close. The tool is designed with a user-friendly interface and...
http://www.nsauditor.com/freeware/downloads/RemShutdown.exe - 421Kb - Download - Screenshot