Axis is a SOAP server from Jakarta. It implements SAAJ (SOAP with Attachments API for Java) from Sun, and SOAP 3 from W3C. Axis runs as a servlet under Tomcat and so gets direct support from all of Tomcat's excellent experience and the expertise of the Tomcat developers. This makes it the strongest open source SOAP server available. It works well, and seems to be quite fast. I'd use it for commercial web services right now.