Observium is an auto-discovering network monitoring platform supporting a wide range of hardware platforms and operating systems including Cisco, Windows, Linux, HP, Juniper, Dell, FreeBSD, Brocade, Netscaler, NetApp and many more. Observium seeks to provide a powerful yet simple and intuitive interface to the health and status of your network.
There two releases available, a community and professional version. If you are looking for a monitoring environment then I can surly advice to give this a try.
The main website: observium.org