Zeus Web Server is a web server for Unix and Unix-like platforms (currently Solaris, FreeBSD, HP-UX and Linux). Support for AIX, Tru64, and Mac OS X was dropped on 10 June 2008. Zeus is designed to be a high-performance web server and was commonly used by hardware vendors submitting SPECweb99 benchmarks for their hardware.
In addition to static content serving, Zeus supports dynamic content via CGI, FastCGI, Apache JServ, ISAPI, NSAPI, mod_perl, SSI and Zeus Distributed Authentication and Content (ZDAC), a proprietary FastCGI-like protocol. While Zeus mainly competes with other commercial web servers such as Sun Java System Web Server, it also claims a high degree of compatibility with Apache HTTP Server, with the expectation that Apache users will migrate to Zeus as their server load increases.