WinPopup Speak!
WinPopup Speak is free add-on for Fomine WinPopup. This application speaks incoming messages that received by Fomine WinPopup.
http://www.fomine.com/products/speak1.exe - 133Kb - 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

Fomine WinPopup
This instant-messaging tool is a powerful replacement for Microsoft WinPopup. Fomine WinPopup is a much better user-friendly application with a handy interface. It has a contact list, which shows user status: online, offline, busy, away. Fomine WinPopup supports many useful features such as... Besides, you can download free add-on, which announces the incoming messages. ... The program has an impressive set of options, which allows you to fully adapt the program to your needs.
http://www.fomine.com/products/winpopup3.exe - 1Mb - Download - Screenshot

My WinPopup Express
WinPopup Express is a software package for writing and exchanging messages within your local network. Secure (not connected to the internet), reliable and easily accessible, this software is available for all versions of Windows. WinPopup Express allows you to send and receive short messages... Thanks to its standardized interface, its set-up is immediate and doesn't require any server or hardware configuration. ... No knowledge of computers is necessary to install and use this software.
http://www.winpopup-express.com/download/mywinpopupexpress.exe - 3Mb - Download - Screenshot

WinPopup Gold
WinPopup Gold is a useful tool to send, receive messages and chat through your local secure network (no internet access). Easy to set up and use (no server need, no ip address to setup), it enables you to point and send messages from other active WinPopup Gold. ... WinPopup Gold detects who is connected, in real time, and then gives you a list of valid destinations to choose from. ... So Usefull and Funny try it now... ... Multi-Languages and Skins support. ... It even lets you send files and assign attributes like sounds and photos to each contact.
http://www.smartison.com/winpopup/dwnapp/winpopupgold.exe - 3Mb - Download - Screenshot

SizePopup
This software allows you sending short texts in computers networks (LAN/WAN). It's similar to the WinPopup, unfortunately win2000 and XP haven't got the WinPopup. Communication is based on a TCP/IP protocol. SizePopup has easy list of users and their IP addresses.
http://www.pool-magic.net/files/SizePopup.exe - 630Kb - Download - Screenshot

Winpopup NET messenger
You do not need to have Internet connectivity to use this feature. WinPopup NET Messenger is a network messaging program ( LAN CHAT ) for Windows, that will allow you to send LAN messages from one computer to another on the same network. You may send the message to the user name or computer name... This program has no relationship whatsoever to the Internet.
http://www.lantalk.net/downloads/winpopup-net.exe - 2Mb - Download - Screenshot

Winpopup LAN Messenger
Winpopup is an ideal business solution for secure network messaging without the need of a server. Inform others of your presence or absence by selecting one of the user status options. The winpopup lan messenger includes an auto responder that offers the convenience of sending automatic replies. ... Give your messages a voice by choosing the message with Winpopup speak add on. ... The winpopup lan messenger is very flexible, for example, you can change the look of the message with font size selection.
http://www.winpopup-lan-messenger....ds/winpopup-lan-messenger-4.5.exe - 1Mb - 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

Fomine LAN Chat
Fomine LAN Chat is tiny and easy-to-use instant messaging software. LAN Chat creates only one chat room, that is why it has very clear interface. The LAN Chat's interface is one window with list of chat participants, chat messages and outgoing message. ... The LAN Chat uses same network protocol like a Winpopup LAN Messenger, OfficePopup and Net Send GUI. ... So you can chat with users of Winpopup LAN Messenger and receive private messages from users of OfficePopup and Net Send GUI. ... Silent installation is useful for network administrators who wish to install LAN Chat without user...
http://www.fomine.com/products/lanchat10.exe - 204Kb - Download - Screenshot