What are the best open source network monitoring systems with trend prediction?

Enterprise-ready monitoring solution, it uses agents (Linux, Windows, AIX, HP-UX, Solaris and BSD systems) and can do both local and remote network monitoring. [Source code is available on GitHub](https://github.com/pandorafms/pandorafms).

Pandora FMS is an elegant and modern system that solves real-world problems quickly. Through a single offering that provides modern and flexible IT monitoring, replacing the costly need for multiple, difficult to integrate monitoring systems.