Caudium is a modern, fast and extensible WWW server derived from Roxen. Caudium is by default compatible with Roxen 1.3 although some incompatible options, mostly introduced to improve the performance, security etc. of the server, can be turned on. Caudium features built-in log parsing engine (UltraLog), XSLT parser, native PHP4 support, multiple execution threads and many more features - see http://caudium.net/ and http://caudium.org/