ONOS with the following key features
high-availability, scalability*, performance*
northbound abstractions (application intentsApplication Intent Framework)
southbound abstractions (OpenFlow adapters)
ONOS code-base on GitHub
documentation & infrastructure processes to engage the community
Note - Segment Routing use case code is in a separate repo here. It will be in mainstream ONOS in Blackbird release.
reactive forwarding, mobility, proxy arp