Lwan is described as 'high-performance web server with a low disk and memory footprint. It can serve both static content and dynamic content generated by C or Lua code' and is a Web Server in the Development category. There are more than 10 alternatives to Lwan for a variety of platforms, including Linux, Windows, Mac, BSD and Self-Hosted solutions. The best alternative is Apache HTTP Server, which is both free and Open Source. Other great apps like Lwan are nginx (Free, Open Source), Caddy (Free Personal, Open Source), lighttpd (Free, Open Source) and Microsoft IIS (Paid).
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