High-end Java application servers Includes products such as BEA's WebLogic, IBM's WebSphere, Oracle's Application Server and Sun's Application Server

JBoss and Tomcat Popular open-source Java application servers (jboss.org and jakarta.apache.org/tomcat)

Macromedia's JRun While ColdFusion runs on top of JRun, this sister application server competes with both ColdFusion and PHP (macromedia.com)

Microsoft's ASP.net The core and also affordable Microsoft Web application platform (asp.net)

Zope The open-source application server based on the Python language (zope.org)

Labs Director Jim Rapoza can be reached at jim_rapoza@ziffdavis.com.

This article was first published on eweek.com.