This is an open source C++ Windows socket (Winsock) TCP/IP library. The claimed features include:

Supports asynchronous Client/Server SSL encryption using OpenSSL.
Supports asynchronous Client/Server Blowfish encryption.
Open source licensing, you can use the library freely as long as you display its copyright with your copyright.
Simple to use, mimics MFC sockets coding style.
Complete control over threading scenarios. (Decide how many threads to use, and how to control them)
Reliable and fast asynchronic sockets. (TCP,UDP and ICMP)
Ability to switch from asynchronic sockets back to blocking mode.
Online code documentation.

Download the latest version Komodia TCP/IP C++ library.