Wintun
Simple and minimal TUN driver for the Windows kernel
...Originally created for WireGuard, it is designed to support a wide range of networking protocols, VPN clients, and experimental network tools. Wintun functions similarly to Linux’s /dev/net/tun and BSD’s /dev/tun, making it useful for developers who need low-level packet handling on Windows. The driver is intentionally minimal, focusing on simplicity, performance, and straightforward integration through the Windows NDIS framework. Applications can integrate Wintun by including a single wintun.dll file, with signed builds available for multiple Windows architectures. ...