ZeroTier, Inc. is a networking software and cybersecurity company with a freemium business model based in San Francisco, California. ZeroTier provides a proprietary network platform and software tools, SDKs, and related commercial products and services to create and manage virtual software-defined networks. The company's flagship end-user product, ZeroTier One, offers a client application that enables devices, such as PCs, phones, servers, routers, and embedded devices to securely connect to zero-trust peer-to-peer virtual networks.