Vim Vim

I am not a fan of old school Editors, but VIM is very powerful and useful specially when you are trapped in console/command line without graphical user interface.
Use CTAGS and CSCOPE along with VIM to make the best use of it!

CTAGS: ctags -R * [To go to the definition, use "Ctrl-]", to go back to stack "Ctrl-t"]
CSCOPE:  cscope -R * [Type "Ctrl-\s" to trace the call, to go back use  Type "Ctrl-t"]

Find more at:
http://courses.cs.washington.edu/courses/cse451/10au/tutorials/tutorial_ctags.html
http://cscope.sourceforge.net/cscope_vim_tutorial.html