The offering from UK developer Zeus is still trailing behind the Apache Software Foundation's Apache server and Microsoft's Internet Information System (IIS), which together have about 90% of the market.
Apache maintains a clear lead with 56.38% market share. By comparison, Zeus has just 2.26% of the market. Its lead over Sun is a mere 0.05% and results from a small decline in Sun sites rather than any substantial growth in Zeus' business.
John Paterson, chief executive at Zeus, said, "The Web server software market is a complex industry which continues to be dominated by free solutions in Apache and IIS. As Web traffic continues to grow and security and scalability become real issues for more companies, firms will have to pay more attention to their fundamental Web infrastructure."
The Zeus platform is available for Unix, Linux and Mac OS X operating systems, but not Windows.
Netcraft's monthly survey looks at more than 37 million Web sites.