Floodlight

The Floodlight Open SDN Controller is an enterprise-class, Apache-licensed, Java-based OpenFlow Controller. It is supported by a community of developers including a number of engineers from Big Switch Networks.

Why Use Floodlight?

-- OpenFlow. Works with physical- and virtual- switches that speak the OpenFlow protocol
Apache-licensed – lets you use Floodlight for almost any purpose

-- Open community. Floodlight is developed by an open community of developers. We welcome code contributions from active participants and we’ll openly share information on project status, roadmap, bugs, etc.

-- Easy to Use. Floodlight is drop dead simple to build and run. Read through the Documentation (link)

-- Tested and Supported. Floodlight is the core of a commercial controller product from Big Switch Networks (link) and is actively tested and improved by a community of professional developers.