Cacti

Odmon.com monitoring system is based on cacti. We are now using fully patched version 0.8.7a. To allow online monitoring, security and many totally independent users and devices, Cacti was modified in order to support this new functionality. Cacti is a great tool and we as developers of odmon were using it for many years now. The problem with cacti that we found is that it needs the server to run on and in some situations that just does not make sense e.g. for home gateway or soho boxes. That is why we have created Online Device Monitoring - Cacti-based server for public use and own monitoring needs.

Following cacti website: "Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices."
More on cacti can be found on www.cacti.net