The Torque Network Library is a robust, secure, easy to use, cross-platform
C++ networking API designed for high performance simulations and games. The
network architecture in TNL has powered some of the best internet
multiplayer action games to date. Whether you're writing a multiplayer game,
developing a complex simulation, or just need a solid foundation for network
apps, TNL will meet your needs.

TNL is available under the GNU General Public License (GPL), an indie
license, and a commercial license.

WWW: https://sourceforge.net/projects/opentnl/