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We've rounded up five open source SDN controllers to get to know.

1. OpenDaylight open-source SDN controller.  announced the release of its open-source , in February 2014. The base edition of Hydrogen includes a modular, multi-protocol SDN controller that's based on , as well as an  plug-in, an OpenFlow protocol library, the  and  tools. With the introduction of an open source SDN controller, OpenDaylight states that it can provide centralized control for any SDN architecture regardless of vendor. The  includes directions on , as well as a programmer guide, FAQs and information regarding the Hydrogen and .

2. OpenContrail SDN controller.  offers an SDN controller as part of its Apache 2.0-licensed project that's used to enable network virtualization. Although considered open, OpenContrail . The controller works along with virtual routers that live on hypervisor hosts, an analytics engine and published northbound APIs. OpenContrail can also act as a network platform for cloud infrastructure. According to the Project, key aspects of its system are network virtualization, network programmability and automation, and big data for infrastructure. The OpenContrail source code is hosted across multiple software repositories, with the core functionality of the system found in the. Additional  are available as well.

3. Floodlight open SDN controller. The Floodlight open SDN controller is a Java-based OpenFlow controller that is also enterprise-class and Apache-licensed. It is part of a . The controller supports a range of virtual and physical OpenFlow switches and it can handle mixed OpenFlow and non-OpenFlow networks. The Controller includes support for the OpenStack cloud orchestration platform as well. Floodlight has already been used in a number of applications, including the  and the . The controller is  on the project website.

4. Ryu OpenFlow controller. Ryu is an SDN framework that offers software components used in SDN applications. It allows developers to create new network management and control applications. Ryu supports various protocols for managing network devices, including OpenFlow,  and.  to learn more about the Ryu network operating system and it is  on the project site.

5. FlowVisor OpenFlow controller.  is a special-purpose OpenFlow controller that acts as a go-between for OpenFlow switches and multiple OpenFlow controllers. The controller enables network virtualization by dividing a physical network into multiple logical networks. The controller ensures that each other controller touches only the switches and resources assigned to it. It also partitions bandwidth and flow table resources on each switch and assigns partitions to individual controllers. The FlowVisor controller is available for download with directions on its .

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