General
Adober Reader: http://get.adobe.com/reader/Chrome: https://www.google.com/intl/en/chrome/browser/
Firefox: http://www.mozilla.org/en-US/firefox/new/
Skype: http://www.skype.com/en/download-skype/skype-for-computer/
Math & Statistics
"R" (Statistical Computing Software): http://www.r-project.org/RStudio (Graphical Interface to R): http://www.rstudio.com/
MATLAB (language for technical computing that integrates computation, visualization, and programming) Kenyon College MATLAB Portal
Biology
Clustal X: http://www.clustal.org/clustal2/Flowers: http://biology.kenyon.edu/courses/biol114/TUTORIAL/gene-schmidel.zip (note: 32-bit computers only)
ImageJ: http://rsb.info.nih.gov/ij/
jmol: http://jmol.sourceforge.net/
Web Page Authoring
BlueGriffon: http://bluegriffon.org/