ONOS with the following key features
high-availability, scalability*, performance*
northbound abstractions (application intents)
southbound abstractions (OpenFlow adapters)
ONOS code-base on GitHub
documentation & infrastructure processes to engage the community
reactive forwarding, mobility, proxy arp
ONOS is distributed under the Apache 2.0 license.
Code Audit Results (Black Duck)
Below are the compatibility reports (pdf) powered by Black Duck Software.