GDBPrint enables developers to viewdata during GDB debugging sessions in a human-friendly way.
You can view the contents of "list<map<int, shared_ptr<string> > > var;" simply typing "pp var".
A macro based system allows to show any kind of class.
Small PHP library to view (1) all the executed MYSQL queries and their result (read data, affected rows, errors and their reason) and (2) all received GET and POST variables. This library makes it very fast to find why queries did not work as expected.