Abyss Web Server X1 is a free personal web server available for Windows, MacOS X, Linux, and FreeBSD operating systems.
Despite its tiny footprint (for example, the executable file size of the Windows version is less than 112 KB); it supports HTTP/1.1, dynamic content generation through CGI/1.1 scripts, Server Side Includes (SSI), custom error pages, and user access control (HTTP authentication/password protected files).
It features also a remote web management interface that makes its configuration as easy as browsing a web site.