What are some alternatives?
When comparing IP Messenger and Ruler, you can also consider the following products
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
MailHog - MailHog is an email testing tool inspired by MailCatcher, but easier to install.
BeeBEEP - You can message and share files inside your intranet without a server.
Printix - Printix is a cloud-based print management platform.
KouChat - KouChat is a simple serverless chat client for local area networks (wifi).
PrinterLogic - PrinterLogic is an enterprise print management software.