Monjo helps monitoring a small to medium network of servers. It offers easy customization of notifications in case of network failures and is designed to allow for easy addition of new services that need to be monitored.
Monjo is written in Python using the Django framework version 1.1. It's internationalized and includes a web interface in English and German. It currently supports notifications by email and can check services using Ping, SMTP, HTTP, POP3, and IMAP4. It's easily extendable using custom modules.
If you find it useful, I'd love to hear about it at mailto: