ZeroTier is a software-defined networking platform that enables users to create virtual networks, or virtual subnets, across multiple physical locations. It provides a secure, distributed, and open-source way to connect devices together, allowing users to securely share files, applications, or resources over the internet without the need for costly hardware or complex setup configurations. It provides a single virtual interface, allowing users to connect all of their devices, regardless of location, to a single virtual network, creating a virtual private network (VPN) that provides secure, encrypted communication. ZeroTier is easy to deploy, configure, and manage, and its open source codebase allows users to customize and extend its features. It's also fully compatible with popular cloud providers, allowing users to extend their networks to the cloud without the need for additional hardware or setup.
Discontinued The project is no longer being developed. The latest version, 0.8, released in December 2010, can still be downloaded from SourceForge.