opennetworking.org
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Open Networking Foundation's site offers an overview of software-defined networking and open networking standards, with information on OpenFlow and ONOS, plus white papers, technical specifications, case studies, events, and other developer resources.
More resources on Software-Defined Networking
Software-Defined Networking
In this course, you will learn about software defined networking and how it is changing the way communications networks are managed, maintained, and secured.
Open Networking Foundation
Standards and resources for SDN
Mininet
Emulator for SDN rapid prototyping
cisco.com
Cisco’s official site provides information on networking hardware, software, and SDN solutions for enterprises and data centers. It offers product pages, developer resources, tutorials, documentation, and case studies to learn about SDN and related technologies.
SDN: Software Defined Networks
SDN: Software Defined Networks - A book resource
networkworld.com
Network World is a technology news and analysis site focused on enterprise networking and IT infrastructure, covering SDN, data centers, cloud, security, and related hardware and software. It offers news articles, features, how-tos, product reviews, and buyer’s guides for IT professionals.