VpnHood offers a free, cross-platform VPN described as a tool for circumvention and privacy.
Open source
24 alternativesNebula
The Nebula project provides a scalable overlay networking tool focused on performance, simplicity, and security.
About Nebula
Nebula is an open source overlay networking tool for building a peer-to-peer software-defined network. It combines encryption, tunneling, certificates and security groups, with a focus on performance, simplicity and security. It is mutually authenticated and based on the Noise Protocol Framework, using certificates to assert a node's IP address, name and group membership.
You can use it to connect computers anywhere in the world, from a small number of machines to tens of thousands. It runs on Linux, macOS, Windows and FreeBSD on desktop and server, with source code available for iOS and Android. It can be installed through distribution packages for Arch, Fedora, Debian and Alpine Linux, through Homebrew for macOS, and as a Docker image.
It suits users who are comfortable setting up networking software from a code repository. Further documentation and a community Slack group are linked from the repository for setup and use.
Key features
- Peer-to-peer overlay network connecting computers worldwide
- Mutual authentication using certificates and Noise Protocol Framework
- Built-in encryption, tunneling and security groups
- Runs on Linux, macOS, Windows, FreeBSD, iOS and Android
- Install via Linux packages, Homebrew or Docker image
- Scales from few computers to tens of thousands
Best for: People who need an open source tool to network distributed computers across platforms.
Good for
- Open source codebase
- Cross-platform desktop, server and mobile support
- Multiple install options including Docker and system packages
- Designed for small and very large networks
Watch out for
- Mobile versions are listed as source code only
- Setup requires working from a code repository
Nebula at a glance
- Website
- github.com/slackhq/nebula
- Category
- Privacy & Security › VPNs
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Nebula FAQ
What is Nebula used for?
Nebula is used to connect computers anywhere in the world into an overlay network, from a few machines to tens of thousands.
Which platforms does Nebula support?
It runs on Linux, macOS, Windows and FreeBSD, with source code available for iOS and Android. Desktop and server builds are offered through releases, system packages and Docker.
Is Nebula open source?
Yes, its code is published on GitHub as slackhq/nebula.
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