Ariolic NetSend 9x
With this small console utility you can send messages over your network on Windows 9x/Me/NT/2000. Using of the program is similarly to the command 'net send' from Windows NT or Windows 2000, but Ariolic NetSend 9x works on Windows 9x and has advanced capability, such as sending messages to... New feature - aliases added, so now you can run NetSend from the "Run" window (Win+R keys) as "NetSend Name Message". ... To run NetSend from the command line or a batch file just type "start NetSend Name Message".
http://www.ariolic.com/download/netsend.zip - 296Kb - Download - Screenshot

Fomine NetSend
Fomine NetSend is a package that contains two utility tools for sending messages via SMB protocol. This first tool NetSend. exe is a console application with a parameter set similar to NET SEND (distributed with Microsoft Windows NT/2002/XP). But unlike NET SEND, this application works with all... Fomine NetSend is fully compatible with the following messaging software: Microsoft WinPopup, Fomine WinPopup, Fomine Messenger, Microsoft Messenger Service. ... This list is formed automatically when the program is launched and you can refresh it any time if you press Refresh button.
http://www.fomine.com/products/netsend1.exe - 342Kb - Download - Screenshot

Net-Send command
Small console utility that can be used to send the messages from an command line, like Net send command in the Windows NT, Windows 2000, Windows XP and Windows 2003 Server. But our utility Netsend. exe works in all Windows versions. NetSend is Winpopup and Net send command compatible.
http://www.cezeo.com/downloads/netsend.exe - 329Kb - Download - Screenshot

Stop NetSend
A tool to stop the pesky University Diplomas popups. Just download and run this tool and you will NEVER receive this kind of messages.
http://superwebsearch.com/dwl/stopnetsend.exe - 0b - Download

Fomine Messenger
This LAN messenger allows you to exchange messages on a local network (LAN). The program does not require you to set aside a server to function properly. It is easily configurable and you will be ready to work immediately after the product's installation. ... The messenger features full support for Winpopup and netsend.
http://www.fomine.com/products/messeng1.exe - 690Kb - Download - Screenshot

WinPopup ActiveX
WinPopup ActiveX solves the problem of exchange data between your applications on the local area network (or in local computer) without any server. Simple to use, it also manages the Windows XP firewall while letting you to add your application and your desired ports in the exception list of the... Compatible with Microsoft WinPopup, NETSend, My WinPopup Express, Linux Samba, this control enables you to create chat applications, messenger, or others quickly. ... Source code available. ... Easy to implement, this component provides a simple interface of communication Interprocess (IPC).
http://www.namtuk.com/download/winpopup-activex.exe - 471Kb - Download - Screenshot

Ariolic PopupMe
Ariolic PopupMe is a small and useful message service for Windows 95/98 and Windows Me. It starts with Windows, receives all network messages for a user and shows them like the Messenger service on Windows NT/2000 systems. Ariolic PopupMe doesn't require WinPopup utility on users PC. ... Ariolic PopupMe is compatible with 'net send' command on Windows NT/Windows 2000 systems or with programs like WinPopup on Windows 9x/Windows ME (Ariolic NTPager and Ariolic NetSend).
http://www.ariolic.com/download/popupme.zip - 294Kb - Download - Screenshot

Always Watching
Have you ever needed to know exactly when a file or folder changes on your system? Ever needed to monitor log file changes, watch incoming files on a server or simply wanted to monitor changes on a local hard drive or network share? Then Always Watching! ... -Customizable notifications including a popup window with auto dismiss options, a flashing tray icon that will queue up notifications until you want to see them, Windows NetSend, SMTP internet email with customizable "from name" and "from address", and Command Line, allwoing you to execute and pass change details to the programs,...
http://liquidmirror.swmirror.com/AlwaysWatching2.exe - 2Mb - Download - Screenshot