Husarnet

Freelan is a free, open-source, multi-platform, peer-to-peer VPN software that abstracts a LAN over the Internet. It works on Windows, Linux and Mac OSX. Whether you want to connect the computers of your family, play an old LAN-only game with your friends, or give privileged access to your private network to your collaborators, freelan will do the job perfectly. Freelan is open-source and completely free. You know everything about its internals and its source code. You are in complete control of the software and your data. You, and nobody else. Freelan allows you to create any kind of network topology you like: from the classical clients-server schema, to the completely crazy hybrid peer-to-peer decentralized graph. It uses only standard, well-established cryptographic algorithms and makes sure that your communications are completely opaque to the outside world. Freelan is written in robust, low-level C and C++ code. It has been thoroughly tested for both stability and performance.

Create a secure network between your servers, computers, and cloud instances. Even when separated by firewalls or subnets, Tailscale just works. A frustratingly complex and brittle collection of firewalls, rules, and holes while wondering if your network is secure enough. Devices connect directly, working from any physical location or networking environment. All without poking holes in your firewall. Devices only connect after signing in through your existing identity provider. Easily enforce multi-factor authentication, deauthorize employees who’ve moved on, and more. Define role-based access controls to restrict sensitive servers or authorize contractors to only see what they need. And every connection is centrally logged from both ends, viewable from a dashboard and logging API.