Anti-Spam SMTP Proxy Server implements multiple spam filters
A Header-Only cross-platform C++ TCP network library
Fast and low latency asynchronous socket server & client C++ library
Ultra fast and low latency asynchronous socket server & client C#
SimpleTester
A simple yet powerful open source VPN solution
Various TCP/IP servers, clients and network management tools
Library that provides communication over a network
Cross-platform C++ libraries with a network/internet focus.