Here are some links that might be useful:

    Make:

    http://www.eng.hawaii.edu/Tutor/Make/.

    FORTRAN:

    http://www.cs.mtu.edu/~shene/COURSES/cs201/NOTES/fortran.html.

    Latex:

    http://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/

    http://www-h.eng.cam.ac.uk/help/tpl/textprocessing/ltxprimer-1.0.pdf.

    http://www.cs.cornell.edu/Info/Misc/LaTeX-Tutorial/LaTeX-Home.html.

    GNUPlot:

    http://www.duke.edu/~hpgavin/gnuplot.html.