Wikipedia
Opsview is a software company specializing in enterprise systems monitoring software for physical, virtual, and cloud-based IT infrastructures. Its headquarters is in Reading, England, with a US office in Woburn, Massachusetts. The product provides a single, unified view of IT operations. The company claims that more than 60,000 businesses and service providers use Opsview to manage their network devices, physical and virtual servers, storage and cloud systems.
Opsview offers a free version - Opsview ATOM, which is limited to 25 monitored hosts. It sells Opsview Pro to SMBs and Opsview Enterprise to larger organizations under a proprietary license. As of March 4, 2015, Opsview Core, the version formerly available via the terms of the GPL, has been discontinued.