F-Stack is a high-performance, open-source network development framework that leverages DPDK and a user-space FreeBSD TCP/IP stack to overcome Linux kernel data packet processing limitations. It achieves ultra-high network performance, handling up to 10 million concurrent connections, 5 million requests per second (RPS), and 1 million connections per second (CPS), by enabling kernel bypass to process data streams in user space with minimal latency through lockless operations and no scheduling or interruptions. Key features of F-Stack include a multi-process architecture for easy expansion, micro-threading support for simplified asynchronous programming, and compatibility with widely used APIs like POSIX, Epoll, and Kqueue. It supports mature applications such as Nginx and Redis, allowing easy integration for high-performance network services. F-Stack has been adopted in several Tencent Cloud products, including DNSPod's DNS servers, HttpDNS, COS access module, and CDN access module, reflecting its practical utility in cloud environments. The project offers comprehensive documentation, API references, release notes, and a programming SDK. Users are encouraged to start using F-Stack by following guides, such as launching an HTTP server on AWS EC2. Overall, F-Stack provides a scalable, low-latency network framework designed for modern high-speed network requirements, combining FreeBSD's robust network stack with DPDK’s user-space packet processing capabilities.