Simple HTTP server, multi-processing, libevent, Technosphere mail.ru 2015
Mongoose Embedded Web Server Library - Mongoose is more than an embedded webserver. It is a multi-protocol embedded networking library with functions including TCP, HTTP client and server, WebSocket client and server, MQTT client and broker and much more.
Nginx C module to allow deeper control of Nginx behaviors by Kong Lua code
Like libevent, libev, and libuv, libhv provides event-loop with non-blocking IO and timer, but simpler apis and richer protocols.
A Lightweight and fully asynchronous HTTP server library based on libev and http-parser for Embedded Linux.