gatling is described as 'A high performance web server. Small! (125k static Linux-x86 binary with HTTP, FTP and SMB support). Fast! (measure for yourself, please) Scalable!' and is an app in the Development category. There are more than 10 alternatives to gatling for a variety of platforms, including Windows, Linux, BSD, Mac and Self-Hosted solutions. The best alternative is Apache HTTP Server, which is both free and Open Source. Other great apps like gatling are nginx (Free, Open Source), Microsoft IIS (Paid), LiteSpeed Web Server (LSWS) (Freemium) and Cherokee (Free, Open Source).
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
The Windows Webserver was developed for testing PHP and CGI/FCGI programs under Windows, without installing an Apache or IIS environment. The Webserver is easy to install and comes with buildin PHP 8.0.3 FastCGI support, mod_rewrite and SSL/TLS 1.2.