Open Source Go Reliable-UDP Libraries

kcptun is a stable and secure tunnel based on KCP with N:M multiplexing and FEC. Available for ARM, MIPS, 386 and AMD64. kcptun is shipped with builtin packet encryption powered by various block encryption algorithms and works in Cipher Feedback Mode, for each packet to be sent, the encryption process will start from encrypting a nonce from the system entropy, so encryption to same plaintexts never leads to a same ciphertexts thereafter. kcptun made use of ReedSolomon-Codes to recover lost packets, which requires massive amount of computation, a low-end ARM device cannot satisfy kcptun well. To unleash the full potential of kcptun, a multi-core x86 homeserver CPU like AMD Opteron is recommended. If you insist on running under some ARM routers, you'd better turn off FEC and use salsa20 as the encryption method.

Hysteria is a high-performance, censorship-resistant proxy and VPN-like networking tool designed to deliver fast, reliable connectivity over unstable or lossy networks by leveraging a custom UDP/QUIC-based transport layer that can masquerade as standard HTTP/3 traffic to evade detection. It supports a wide range of use cases including SOCKS5 and HTTP proxying, TCP/UDP forwarding, Linux TProxy for network redirection, and even tunneling via TUN interfaces, making it a flexible choice for developers and network engineers needing robust remote access or traffic obfuscation. Because it’s implemented in Go and MIT-licensed, the project provides cross-platform builds for major operating systems and architectures, letting users deploy servers and clients for both personal and infrastructural purposes.

NodePass is a lightweight enterprise-grade TCP and UDP tunneling solution for handling complex network access scenarios. It uses an all-in-one architecture that separates control and data channels while keeping deployment simple for administrators. The project supports zero-configuration setup, connection pooling, protocol conversion, and tiered TLS encryption. It is designed for DevOps professionals and system administrators who need reliable forwarding across restricted, segmented, or operationally complex networks. NodePass can be used to expose internal services, bridge environments, manage tunnels, and create fast network paths through pre-established connections. Its focus is practical tunnel management with high performance, flexible instance control, and deployment patterns that work across client and server environments.

kcp-go is a production-grade reliable UDP library for Go that provides ordered, error-checked stream delivery over UDP packets. It implements the KCP protocol and is built for applications that need lower latency than traditional TCP in challenging network environments. The library has been used in contexts such as online games, live broadcasting, file synchronization, and network acceleration. It exposes interfaces that are compatible with Go’s standard net.Conn style, making it easier for developers to integrate into existing networking code. kcp-go also includes advanced capabilities such as forward error correction, encryption support, packet-level tuning, and performance-oriented session management. It is intended for developers who need a fast, resilient transport layer and are comfortable tuning bandwidth, latency, and reliability tradeoffs.

Supported protocol: TCP, UDP, RUDP (Reliable UDP), RICMP (Reliable ICMP), RHTTP (Reliable HTTP), KCP, Quic. Support type: forward proxy, reverse agent, SOCKS5 forward agent, SOCKS5 reverse agent. Agreement and type can be freely combined. External agent agreement and internal forwarding protocols can freely combine. Support Shadowsocks plug-in, spp-shadowsocks-plugin, spp-shadowsocks-plugin-android.