What are some alternatives?
When comparing Bopup IM Suite and LAN Messenger, you can also consider the following products
Ruler - It's a screen ruler for Windows.
BORGChat - BORGChat is a LAN messaging software program.
Feem - Share files offline. No servers. No cloud. No limits.
Winpopup LAN Messenger - Winpopup LAN Messenger is a cost-effective Office, Corporate, Enterprise Instant Messaging solution.
BeeBEEP - You can message and share files inside your intranet without a server.
qchat - QChat is a simple crossplatform LAN chat.