CGDB is a curses (terminal-based) interface to the GNU Debugger (GDB).
Its goal is to be lightweight and responsive; not encumbered with
unnecessary features.

The primary feature of CGDB is the constant presence of a source
display (screenshots), updated as the program executes, to help keep
you focused while debugging. The interface is inspired by the classic
Unix text editor, vi. Those familiar with vi (or vim) should feel right
at home using CGDB.