The dddebugger product
The dddebugger product contains the Data Display Debugger version 2.1 from
http://www.gnu.org/software/ddd/
which requires an X window terminal to be useful, and can act as a
front end for either gdb from the (gdb product) or dbx (from the
vendor's compiler suite).
It is invoked as "ddd", or "dddebugger", the product is named differently
to avoid a clash with an existing "ddd" product.
Release notes for the product are available.