The first official release of OpenDaylight, HYDROGEN, is available for download at their website since February 4, 2014. It is a promise among the SDN controllers. It is an Open source project, and a lot of huge colaborators are part of it, like Cisco and Juniper.
Cisco have already brought to the market a comercial version of it. The Cisco XNC 1.5 has a few more features than ODL such as interface with Cisco OnePK and it is part of the Cisco ONE (Open Network Environment).
Still, the ODL controller is a big name and in this series of tutorial posts we will go through installation and configuration of basic functionalities.
If you just want to be introduced to the ODL the easiest way to install it is not actualy to installing it. Instead just download this VM with all the required code you need to run it.
You can easily deploy this VM on Virtualbox, or VMware Workstation. Source: HERE.
Ps.: If you want to actually install it, you can follow this tutorial. In the future I will post a tutorial with ODL installation for developing purpose.
Configuration comes next.