GNU Make
Free Software Foundation GNU Make.
GNU Make manual in various formats.
GNU Make manual local pdf copy.

GNU Emacs
Free Software Foundation GNU Emacs.
GNU Emacs manual in various formats.
GNU Emacs manual local pdf copy.
GNU Emacs Lisp Intro manual in various formats.

GNU GCC
Free Software Foundation GNU GCC.
GNU GCC 3.0.1 manual.
GNU CPP 3.0.1 manual.

GNU Plotutils
Free Software Foundation GNU Plotutils.
GNU Plotutils manual in various formats.

Grace
Grace Home page is here.
Grace Users Guide.
Grace Tutorial .

Gimp
Gimp home page is here.
Gimp Users Manual.