Abyss Web Server X1 is a free, personal Web server. Despite its small footprint, it supports secure SSL connections (HTTPS), 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.
eXtended Server Side Includes (XSSI) support through the addition of new directives (#if, #elif, #else, #endif, and #set) to enable flow control and advanced variables setting and substitution constructs,
On-the-fly HTTP compression to save bandwidth by automatically sending GZipped output to browsers which support HTTP compression,
Advanced URL Rewriting rules with support for back-references from matched conditions (%1 ... %9),
Full control over accepted SSL Ciphers,
Updated ASP.NET connector for the Windows version with support for ASP.NET 1.1, 2.0, and 3.5,
Improved support for multicore processors,
Updated documentation.