Links:
[1] http://www.caloriescount.org/calculator.html
[2] http://www.math.com/students/tools.html
[3] http://www.healthcare.ubc.ca/calc/clinsig.html
[4] http://www.cebm.utoronto.ca/practise/ca/statscal
[5] http://www.writing.eng.vt.edu/posters.html
[6] http://ublib.buffalo.edu/libraries/asl/guides/bio/posters.html