Tornado Web Server is described as 'Tornado is an open source version of the scalable, non-blocking web server. The framework is distinct from most mainstream web server frameworks (and certainly most Python frameworks) because it is non-blocking and reasonably fast' and is an app in the Network & Admin category. There are more than 25 alternatives to Tornado Web Server for a variety of platforms, including Windows, Linux, Mac, Self-Hosted solutions and BSD. The best alternative is Apache HTTP Server, which is both free and Open Source. Other great apps like Tornado Web Server are nginx (Free, Open Source), lighttpd (Free, Open Source), Microsoft IIS (Paid) and Abyss Webserver (Freemium).
nginx [engine x] is a HTTP and reverse proxy server, as well as a mail proxy server written by Igor Sysoev. It has been running for more than five years on many heavily loaded Russian sites including Rambler (RamblerMedia.com).
Internet Information Services (IIS) for Windows® Server is a flexible, secure and easy-to-manage Web server for hosting anything on the Web. From media streaming to web application hosting, IIS’s scalable and open architecture is ready to handle the most demanding tasks.
LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement. LSWS is the 4th most popular web server on the internet and the #1 commercial web server. Upgrading your web server to LiteSpeed Web Server will improve your performance and lower operating costs