QDjango, a Qt-based C++ web framework
https://github.com/jlaine/qdjango/

An asynchronous web framework for C++ built on top of Qt
http://vinipsmaker.github.io/tufao/
https://github.com/vinipsmaker/tufao

C++ websocket client/server library
http://www.zaphoyd.com/websocketpp

WebSocket to TCP Gateway (for MQTT)
https://github.com/stylpen/WSS

Boost.Http
https://github.com/BoostGSoC14/boost.http

Qt based tcp-ip c/s frame work.
https://github.com/goldenhawking/zpserver

QDjango，tufao，C++ websocket client/server