jStates is a javalibrary for easy state machine design and implementation.It uses XML to define states and state transitions. jStates is aimed at easy integration with desktop J2SE applications, Struts, Commons Validator, Web and other J2EE technologies
JDBC Tester is a software that allows to prove JDBC connections and SQL statements. The central idea is to have a software that is used for the design of statements and learning SQL with an graphical user interface simple to use.
nsjava is a loadable c-module which embeds a java virtual machine in aolserver. This module is being developed to support the openacs project - see http://openacs.org, but it could find general application as a web development tool.