CppCMS is the web development framework written in C++, that is aimed on development of highperformance web application. It uses different web APIs, most noticably FastCGI, as a web layer and various databases as a storage backed.
A highperformance, middleware oriented C++14 http web framework
Silicon is a C++ abstraction built on top of high-performance networking libraries. Its goal is to ease the writing of web APIs without compromising on performance. A simple mono-procedure API serving a static string under the route /hello/world. mhd_json_serve is a Silicon backend. It takes an API and serves it with the microhttpd C library. It relies on the JSON format whenever it has to encode or decode objects (procedures parameters and return values).