opsview: еще система мониторинга

http://www.opsview.com/
Это несколько улучшенный и переточенный nagios, с добавленными графиками и прочим.

http://www.linuxhome.ru/tag/opsview/

Есть в бесплатном и платных вариантах.

http://en.wikipedia.org/wiki/Opsview

Opsview is a software company specializing in enterprise systems monitoring software for physical, virtual, and cloud-based IT infrastructures.^[1] Its headquarters is in Reading, England, with a US office in Woburn, Massachusetts. The product aims to provide a single, unified view of IT operations. The company claims that more than 30,000^[2] businesses and service providers use Opsview to manage their network devices, physical and virtual servers, storage and cloud systems.

Opsview sponsors a free, open-source software version - Opsview Core. It sells Opsview Pro to SMBs and Opsview Enterprise to larger organisations under a proprietary license.^[1]