Open Source C++ Reliable-UDP Libraries

FBNetwork is a high-performance, windows based, C++ library. It supports reliable UDP connection(which can ensure the sequence and arrival of the packages) based on datagram/data stream, NAT traversing, asynchronization and blocking, message handling.

Combined client+server UDP based file transfer application. Based on the UDT protocol - via libudt - http://udt.sourceforge.net/ UDT is a reliable UDP based application level data transport protocol. UDT is designed for extremely high speed networks and it has been used to support global data transfer of terabyte sized data sets. Ne Plus Ultra is built to have extremely minimal dependencies (statically linked against libudt.a) to ensure maximum portability and ease of use. https://github.com/bcwinters/neplusultra

A simple cross-platform resending (reliable) UDP packet library written in C++.

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.

A cross platform and multithreaded reliable UDP library written in C++.