From Aprelium Technologies:
Abyss Web Server X1 is a free, personal Web server. Despite its small footprint, it supports CGI scripts, FastCGI, ISAPI extensions, ASP.NET, server-side includes (SSI), download resuming, caching negotiation, logging, custom error pages, password protection, IP address control, URL rewriting, aliases, custom MIME types, index files, custom directory listings, anti-leeching, and bandwidth throttling. It also features an automatic anti-hacking system and an intuitive multilingual remote Web management interface. With Abyss Web Server X1, hosting your site and your PHP, Perl, Python, ASP, Ruby on Rails, or ASP.NET Web applications takes only a few minutes. Versions for Mac OS X, Linux, and FreeBSD are also available.