Twisted is an event-driven networking engine written in Python. Twisted makes it easy to implement custom network applications, both servers and clients. It also supports many common network protocols, including SMTP, POP3, IMAP, SSHv2, DNS and lot more. The twisted.web webserver is a scalable, small-footprint web server that's easy to configure. It's efficient enough to serve a high-traffic website.

Twisted - Networking Engine in Python

Tengine is a web server originated by Taobao, the largest e-commerce website in Asia. It is based on the Nginx HTTP server and has many advanced features. Tengine has proven to be very stable and efficient on some of the top 100 websites in the world, including taobao.com and tmall.com.
 
It includes all features of nginx-1.8.1 and it is 100% compatible with nginx, Dynamic module loading support. You don't need to recompile Tengine when adding new modules to it, HTTP/2 support, Sends unbuffered upload directly to HTTP and FastCGI backend servers, which saves disk I/Os, More load balancing methods and lot more.

Tengine is a web server originated by Taobao, the largest e-commerce website in Asia. It is based on the Nginx HTTP server and has many advanced features. Tengine has proven to be very stable and efficient on some of the top 100 websites in the world, including taobao.com and tmall.com.

tengine - A distribution of Nginx with some advanced features

Apache web server is most popular and widely used web servers. Its features could be extended using modules. mod_proxy is a proxy module, mod_ssl provides ssl support, mod_rewrite provides URL rewriting etc. Virtual hosting is supported. Multiple websites could be accessed from single web server.

Apache Web Server - Most popular web server on the Internet

Caddy is a general-purpose HTTP/2 web server that serves HTTPS by default. Caddy is fast, easy to use, and makes you more productive.
<ul>
<li>Easy configuration with the Caddyfile</li>
<li>Automatic HTTPS on by default (via <a href="https://letsencrypt.org">Let's Encrypt</a>)</li>
<li>HTTP/2 by default</li>
<li>Virtual hosting so multiple sites just work</li>
<li>Experimental QUIC support for those that like speed</li>
<li>TLS session ticket key rotation for more secure connections</li>
<li>Extensible with plugins because a convenient web server is a helpful one</li>
<li>Runs anywhere with no external dependencies (not even libc)</li>
</ul>

Caddy is a general-purpose HTTP/2 web server that serves HTTPS by default. Caddy is fast, easy to use, and makes you more productive.

Caddy - Fast, cross-platform HTTP/2 web server with automatic HTTPS

FAPWS (Fast Asynchronous Python Web Server) is a fully WSGI compliant web server for the Python environment with 2 main objectives: keep it small and asynchronous. That way it will not heat your HW resources and will assure to not fall into C10K troubles. It can handle as much as concurrent request as your kernel can handle, Gzip support for on the fly compression and lot more.

fapws3 - Fast Asynchronous Python Web Server (based on libev)

Undertow is a flexible performant web server written in java, providing both blocking and non-blocking API’s based on NIO. Undertow has a composition based architecture that allows you to build a web server by combining small single purpose handlers. The gives you the flexibility to choose between a full Java EE servlet 3.1 container, or a low level non-blocking handler, to anything in between. 

Undertow - High performance non-blocking Webserver

gatling is a high performance web server for Linux. It is small, fast, Scalable. It has IPv6 support, Connection Alive, HTTP, FTP and SMB support. 

gatling - a high performance web server for Linux

thttpd is a simple, small, portable, fast, and secure HTTP server.  It also has one extremely useful feature (URL-traffic-based throttling) that no other server currently has. Plus, it supports IPv6 out of the box, no patching required. 

thttpd - tiny/turbo/throttling HTTP server

A screamingly fast, ultra-lightweight WSGI server for CPython, written in C using Marc Lehmann's high performance libev event loop and Ryan Dahl's http-parser. It is single threaded and it has less memory foot print.

bjoern - Fast And Ultra-Lightweight HTTP/1.1 WSGI Server

LittleProxy is a high performance HTTP proxy written in Java atop Trustin Lee's excellent Netty event-based networking library. It's quite stable, performs well, and is easy to integrate into your projects. A proxy server like LittleProxy contains always a web server, too. If you get an URI without scheme, host and port in originalRequest it's a direct request to your proxy. You can return a HttpFilters implementation which answers responses with HTML content.

LittleProxy - High Performance HTTP Proxy

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