Open Source KCP Software
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KCP Software
View 8815 business solutionsBrowse free open source KCP software and projects below. Use the toggles on the left to filter open source KCP software by OS, license, language, programming language, and project status.
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frp
A Fast Reverse Proxy
frp stands for exactly what it is: a fast reverse proxy. It helps you expose a local server behind a NAT or firewall to the Internet. It is currently under development, but already supports TCP and UDP, as well as HTTP and HTTPS protocols where requests can be forwarded to internal services by domain name. It also has a P2P connect mode and many other nifty features. These include configuration files, environment variables, a dashboard that shows you frp's status and proxies' statistics information, an Admin UI that helps you check and manage frpc's configuration, and many others. -
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kcptun
A stable and secure tunnel based on KCP with N:M multiplexing and FEC
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. -
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gost
GO Simple Tunnel, a simple tunnel written in golang
A simple security tunnel written in Golang. Listening on multiple ports, multi-level forward proxies - proxy chain, standard HTTP/HTTPS/HTTP2/SOCKS4(A)/SOCKS5 proxy protocols support. Probing resistance support for web proxy, TLS encryption via negotiation support for SOCKS5 proxy. Support multiple tunnel types, tunnel UDP over TCP. Local/remote TCP/UDP port forwarding, TCP/UDP Transparent proxy, Shadowsocks Protocol (TCP/UDP), and SNI Proxy. Permission control, load balancing, route control, DNS resolver and proxy, and TUN/TAP Device. In GOST, GOST and other proxy services are considered as proxy nodes, GOST can handle the requests itself, or forward the requests to any one or more proxy nodes. In addition to configuring services directly from the command line, parameters can also be set by specifying the external configuration file with the -C parameter. -
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GO Simple Tunnel
A simple tunnel written in golang
GOST, or GO Simple Tunnel, is a flexible tunneling and proxy tool written in Go for building secure traffic forwarding chains. It supports proxying, port forwarding, reverse proxying, and tunnel-based access to services behind NAT or firewalls. The project is designed around protocol composition, allowing users to combine multiple protocols into multi-level forwarding chains. It can handle TCP and UDP forwarding, transparent proxying, DNS proxying, TUN/TAP workflows, and tun2socks scenarios. GOST also includes operational features such as load balancing, routing control, admission control, rate limiting, dynamic configuration, Prometheus metrics, and a Web API. It is useful for network engineers, developers, and self-hosters who need a configurable, cross-platform networking toolkit for complex proxy and tunnel setups. -
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Mirror
#1 Open Source Unity Networking Library
Mirror is a high-level open-source networking library for Unity multiplayer games. It was originally based on UNET and has evolved into a stable, modular framework used by many production Unity projects. The library is designed to make multiplayer development easier by handling common networking patterns such as network identities, synchronization, remote procedure calls, authority, spawning, and transport integration. Mirror supports multiple low-level transports, making it adaptable to different game genres and deployment needs. It is suitable for small multiplayer games, cooperative games, competitive prototypes, and even larger persistent-world or MMORPG-style projects. The project is especially useful for Unity developers who want a mature networking layer without building protocol and synchronization systems from scratch. -
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paqet
Ferries Packets Across Forbidden Boundaries
paqet is a bidirectional packet-level proxy that transports traffic over raw packets instead of relying on the host operating system’s normal TCP/IP stack. It forwards traffic between a local client and a remote server using KCP as the reliable transport layer. The project is written in Go and is aimed at users who need a low-level tunnel that can operate in restricted or heavily filtered network environments. It is described as an alpha-stage tool, so compatibility and protocol behavior may change between releases. Paqet is most relevant to technical users who are comfortable with raw sockets, server-client tunnel setup, and system-level networking requirements. It should be used responsibly for authorized connectivity, testing, and research scenarios where the user controls the infrastructure. -
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spp
A simple and powerful proxy
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. -
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GSnova
Private proxy solution & network troubleshooting tool
GSnova is a high-performance proxy tool for bypassing internet censorship and securing network traffic through a range of supported transport protocols. It acts as a multi-protocol client/server proxy that can tunnel traffic over TLS, WebSocket, KCP, QUIC, and SSH. GSnova is optimized for resilience and speed under restrictive network conditions and supports multiple fronting strategies and obfuscation techniques. It's particularly suited for users in highly censored environments and developers building resilient networking tools. -
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YASIO
A multi-platform support c++11 library with focus on asio
yasio is a lightweight C++ asynchronous socket I/O library for client applications across desktop, mobile, game, and embedded-style environments. It supports Windows, macOS, iOS, Android, OHOS, Linux, FreeBSD, Solaris, and other Unix-like systems. The library focuses on practical cross-platform networking rather than tying developers to a single engine or operating system. It is used in game and multimedia projects and provides integrations or demos for Unity, Unreal Engine, xlua, axmol, and related development stacks. yasio can be used for TCP, UDP, SSL, IPv6, KCP, and multi-threaded networking scenarios. It is useful for developers who need a portable socket layer that works consistently across games, apps, tools, and custom client software. -
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kcptun for Android
Android plugin that brings kcptun acceleration support
kcptun for Android is an Android plugin that brings kcptun acceleration support to the Shadowsocks Android ecosystem. It is designed as a SIP003 plugin, which means it can be used alongside shadowsocks-android rather than functioning as a standalone VPN client. The project packages kcptun client functionality for Android users who want to route Shadowsocks traffic through a KCP-based transport layer. Its main purpose is to improve connection behavior in unstable or high-latency network conditions by using kcptun’s reliable UDP tunneling approach. The repository includes Android application code, plugin integration files, and localization support through the same translation process used by shadowsocks-android. It is best understood as a specialized networking companion for users who already understand Shadowsocks and kcptun configuration. -
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xkcptun
xkcptun is kcp tunnel for OpenWRT&LEDE, implemented in c language
xkcptun is a C-language implementation of kcptun built on KCP and libevent2. It is mainly designed for embedded and router-oriented environments such as LEDE and OpenWrt, where lightweight networking tools are often preferred. The project provides client and server components that use KCP-based tunneling to improve performance over unreliable or high-latency network links. It also includes a spy utility, making the generated build more than a minimal two-binary tunnel setup. xkcptun can be built with CMake and supports static linking for easier deployment on constrained systems. It is most relevant to users who need a compact KCP tunnel implementation for routers, gateways, and custom network appliances. -
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KCP
A fast and reliable ARQ protocol
KCP is a fast and reliable protocol that can achieve the transmission effect of a reduction of the average latency by 30% to 40% and reduction of the maximum delay by a factor of three, at the cost of 10% to 20% more bandwidth wasted than TCP. It is implemented by using the pure algorithm, and is not responsible for the sending and receiving of the underlying protocol (such as UDP), requiring the users to define their own transmission mode for the underlying data packet, and provide it to KCP in the way of callback. Even the clock needs to be passed in from the outside, without any internal system calls. The entire protocol has only two source files of ikcp.h, ikcp.c, which can be easily integrated into the user's own protocol stack. You may have implement a P2P, or a UDP-based protocol, but are lack of a set of perfect ARQ reliable protocol implementation, then by simply copying the two files to the existing project, and writing a couple of lines of code, you can use it. -
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KCP C#
KCP C# version. Thread safe, no alloc at runtime, no pressure on gc
KumoKyaku KCP is a C# implementation of the KCP reliable UDP protocol designed for high-performance .NET applications. It provides ready-to-use APIs while also allowing advanced users to customize segment handling and memory behavior. The project uses unsafe code and unmanaged memory internally to reduce garbage collection pressure, which is important for real-time systems. It supports Span<byte>, external buffer rental, and a generic KcpCore<Segment> architecture for performance-focused implementations. The library is partly thread-safe, allowing concurrent Send and Input calls while restricting concurrent Recv and Update calls for correctness. It is useful for game networking, real-time communication, and other latency-sensitive C# applications that need reliable delivery over UDP. -
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goflyway
An encrypted HTTP server
master is the active development branch and contains v2 code, for the stable v1 release (though it was once called v2.0), please refer to v1.0 branch. goflyway v2 is a special tool to forward local ports to a remote server securely, just like ssh -L. goflyway uses pure HTTP POST requests to relay TCP connections. There is no CONNECT involved nor needed because goflyway is designed mainly for those people who are behind a CONNECT-less HTTP proxy or want to accelerate connections through static CDNs. However pure HTTP requesting is definitely a waste of bandwidth if you already have a better network environment, so use -w to turn on WebSocket relay, or -K to turn on KCP relay if possible. In HTTP mode when the server received some data it can't just send them to the client directly because HTTP is not bi-directional, instead, the server must wait until the client requests them, which means these data will be stored in memory for some time. -
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java-Kcp
Reliable udp network library (kcp algorithm) based on java netty
java-Kcp is a Java implementation of the KCP reliable UDP protocol built on top of Netty. It is designed for applications that need fast, reliable communication over UDP, especially games, video systems, and network acceleration services. The project includes forward error correction support and aims to remain compatible with other KCP implementations, including C, Go, and a related C# version. Its documentation provides server and client examples, usage parameters, best practices, troubleshooting notes, and performance testing information. The library is positioned as stable enough for real projects and has been used in online production scenarios. It is useful for Java backend developers who need low-latency network transport without giving up reliability features. -
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kcp-go
A crypto-secure Reliable-UDP library for Golang with FEC support
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. -
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libhv
Network library for developing TCP/UDP/SSL/HTTP/WebSocket/MQTT client
Like libevent, libev, and libuv, libhv provides event loop with non-blocking IO and timer, but simpler api and richer protocols. Cross-platform (Linux, Windows, MacOS, BSD, Solaris, Android, iOS) High-performance EventLoop (IO, timer, idle, custom) TCP/UDP client/server/proxy. TCP supports heartbeat, reconnect, upstream, MultiThread-safe write and close, etc. Built-in common unpacking modes (FixedLength, Delimiter, LengthField) RUDP support: WITH_KCP. SSL/TLS support: (via WITH_OPENSSL or WITH_GNUTLS or WITH_MBEDTLS) HTTP client/server (support https http1/x http2 grpc). HTTP supports static service, indexof service, proxy service, sync/async API handler. HTTP supports RESTful, router, middleware, keep-alive, chunked, SSE, etc. WebSocket client/server.
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