Abyss Webserver is described as 'Abyss Web Server is a compact web server available for Windows, Mac OS X, Linux, and FreeBSD operating systems' and is an app in the Development category. There are more than 25 alternatives to Abyss Webserver for a variety of platforms, including Windows, Linux, Mac, Self-Hosted solutions and BSD. The best alternative is XAMPP, which is both free and Open Source. Other great apps like Abyss Webserver are Apache HTTP Server (Free, Open Source), nginx (Free, Open Source), Caddy (Free Personal, Open Source) and lighttpd (Free, Open Source).
XAMPP is a completely free, easy to install Apache distribution containing MariaDB, PHP, and Perl. The XAMPP open source package has been set up to be incredibly easy to install and to use. XAMPP is free even for commercial uses
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).
UwAmp is a Wamp Server with Apache MySQL PHP and SQLite, and it comes with an very smart interface that offers various information, configuration and commands for the server. It can handle multiple php versions and monitor cpu usage. Also it is able to run in U3 mode.
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.