https://www.defined.net/
https://www.defined.net/nebula/introduction/

https://github.com/slackhq/nebula

https://noiseprotocol.org/

2021
https://www.opennet.ru/opennews/art.shtml?num=56142
2020
https://slack.engineering/introducing-nebula-the-open-source-global-overlay-network-from-slack/