Sming - powerful open source framework simplifying the creation of embedded C++ applications.
TouchSocket is an integrated .NET networking framework that includes modules for socket, TCP, UDP, SSL, named pipes, HTTP, WebSocket, RPC, and more. It offers a one-stop solution for TCP packet issues and enables quick implementation of custom data message parsing using protocol templates.
WatsonTcp is the easiest way to build TCP-based clients and servers in C#.
Simple wrapper for TCP client and server in C# with SSL support