Servlet API 2.1 servlet container. It provides HTTP/1.1 compliance and has an easy to use admin interface. [Open Source, GPL]

XML Application Server for Apache. Provides on-the-fly conversion from XML to any format, such as HTML, WAP or text using either W3C standard techniques, or custom code. AxKit also uses a built-in Perl interpreter to provide for XML transformation.

Java-based application server with XML features, licensed under BSD-like license

XML/XSLT processor utilizing Apache and mod_python.

Open Source Enterprise Java Beans (EJB) Container System and Server. [BSD-style license]

Distributed platform compliant with the EJB specifications [MPL-like license]

XML-compliant templating solution for PHP

Java-based framework for portal applications, providing API's and ready-to-use tools for pages, portlets, user management, content management, collaboration and community services. (LGPL)

OpenThought is a Web application engine. Designed to create pages that communicate with web server from DHTML using XML to update portions of page rather than requiring entire page reloads.

Sue Spielman looks at JSP and XSP to help you decide which is right for your development needs.