Xfig is a menu-driven tool that allows the user to draw and manipulate
objects interactively in an X Window System window. The resulting
pictures can be saved, printed on PostScript printers, or converted to
a variety of other formats (to allow inclusion in LaTeX documents, for
example).

Documentation: /usr/share/doc/packages/xfig & man xfig

Examples: /usr/share/doc/packages/xfig/TheExamples