Kieker is a framework for continuous monitoring and dynamic analysis of distributed software systems. Being designed for continuous operation, it induces only a low overhead. The TraceAnalysis tool allows to analyze and visualize trace information.
A little tool writen in java to trace the execution plan for a given database query. It works with Oracle 10g or higher and uses the JGoodies look and feel. You need to provide the Oracle.com JDBC-Driver and the JGoodies.org looks look and feel.
Source is now located at Github https://github.com/mgeiss/oraxtra.