This is the home of the Aether Project, originally incubated at ONF and now a stand-alone project of the Linux Foundation. (It also hosts a read-only mirror of ONF's flagship SDN Controller, ONOS.) Aether integrates multiple subsystems, with associated repos also located here and here. Aether documentation is available at https://docs.aetherproject.org and a community wiki at https://wiki.aetherproject.org.
Contributions include a Developer Certificate of Origin stating that you agree to the terms published at https://developercertificate.org/.
