Enterprises turn to the private cloud market for fast provisioning of resources, delivering public cloud-like capabilities internally. However, this market comprises more than one category of offerings. This report provides infrastructure and operations (I&O) professionals with a high-level overview of more than 30 software-only private cloud service providers and is the second in a series of three reports that detail the vendor landscape and segmentations of the private cloud market. This report discusses taxonomy and provides high-level information about the vendors and open source offerings available. This is an update of a previously published report; Forrester reviews and revises it periodically for continued relevance and accuracy. We are updating this edition to reflect the current state of the private cloud software solutions market.