http://jakarta.apache.org/tomcat/

Tomcat 5.5.x. Tomcat 5.5 is the current focus of development. While it supports the same Servlet and JSP Specification versions as Tomcat 5.0.x, there are significant changes in many areas under the hood, resulting in improved performance, stability, and total cost of ownership. Please refer to the Tomcat 5.5 Changelog for details.

Tomcat 5.0.x. Tomcat 5.0 improves on Tomcat 4.1 in many ways, including:

* Performance optimizations and reduced garbage collection
* Refactored application deployer, with an optional standalone deployer allowing validation and compilation of a web application before putting it in production
* Complete server monitoring using JMX and the manager web application
* Scalability and reliability enhancements
* Improved Taglibs handling, including advanced pooling and tag plugins
* Improved platform integration, with native Windows and Unix wrappers
* Embedding of Tomcat using JMX
* Enhanced Security Manager support
* Integrated session clustering
* Expanded documentation



respect! -)