Powerful, enterprise-ready, open source web server w/ automatic HTTPS
Python HTTP library with thread-safe connection pooling
HTTP server mocking and expectations library for Node.js
A powerful server and network library, including coroutine
REXX interpreter
Relational Database
An http 1.1 server written in Java
A software components library
Ultra fast and low latency asynchronous socket server & client C#
Fast and low latency asynchronous socket server & client C++ library
Embedded C/C++ Web Server
A Header-Only cross-platform C++ TCP network library
Martian is a library for building custom HTTP/S proxies
The Classic Webware for Python
A fast, light-weight proxy for memcached and redis
An Open Source "product catalogue" that is customizable and versatile.
Small Java based REST server
Automatically updates and applies certificate revocation lists
HTTP Library for Lua. Supports HTTP(S) 1.0, 1.1 and 2.0
Multiple server/webapp vulnerability scanner