nebula

Nebula is a scalable, secure overlay networking tool designed for seamless connectivity among computers globally, operating on multiple platforms including Linux, Windows, and mobile devices. Its notable features include mutually authenticated peer-to-peer communication, user-defined security groups for traffic filtering, and the ability to function behind NATs through UDP hole punching. Built on the Noise Protocol Framework, it employs advanced encryption using ECDH key exchange and AES-256-GCM, making it suitable for creating secure, flexible network environments across diverse infrastructures.