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Nebula

Scalable overlay networking tool from Slack

Remote Access & VPN ★ 17.6k stars Hard setup MIT

Nebula is an open-source overlay networking tool built for scalability and security, originally created at Slack. It uses a certificate-based model to connect hosts across the internet.

Key features

  • Certificate-based identity
  • Scales to large fleets
  • Built-in firewall rules
  • Cross-platform binaries

Strengths

  • Released under the MIT license
  • Mature project with 17.6k GitHub stars
  • Written in Go
  • Tiny footprint — runs in 64 MB RAM

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