The stack tracer is an delphi library for help to make exception handling to informative. The library is written for Delphi 7, but i think will work also on the 5 and 6 versions.
Open Perl IDE is a visual, integrated development environment for writing and debugging Perl scripts with any standard Perl distribution under Windows 95/98/NT/2000.
JdbcProxy is a JDBC 2.0 driver that can help debug or test applications. The driver can wrap another JDBC driver to debug the JDBC calls done by the application. The driver can also emulate another JDBC driver to test the application without a database.