ANNAPOLIS, MD - Zenoss, a commercial open source software company delivering network, server and application monitoring solutions, has raised $4.83 million of a $5.2 million round, according to a regulatory filing. The company previously raised about $20 million.

Investors include many venture firms we know well, Grotech Ventures, Intersouth Partners, Boulder Ventures, Amplifier Venture Partners, Silicon Valley Bank and the Maryland Department of Business and Economic Development’s Enterprise Investment fund.

Founded in 2005, the company’s products monitor more than one million network and server devices daily and have been used by more than 25,000 organizations in 180 countries. Zenoss Enterprise is a single model, commercial open source-based product that enables organizations to seamlessly manage physical, virtual and cloud based infrastructure.

Commercial customers include leading companies such as Rackspace, VMware, LinkedIn, Carlson, Motorola and Deutsche Bank.

In April, it won he 2010 Innovator award by the Chesapeake Regional Tech Council (CRTC). In 2009, Zenoss also won CompTIA’s Innovator of the Year in Enterprise Software.

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Tags: Amplifer, Boulder Ventures, DBED, financing, Grotech, Intersouth Partners, IT management, Maryland, open source, SVB, Zenoss