Statistical Tables
For Students-T, F, Chi-Square and Z: http://www.statsoft.com/textbook/sttable.html
Just the T: http://www.socr.ucla.edu/Applets.dir/T-table.html
Critical values of the Pearson Product-Moment Correlation Coefficient: http://www.gifted.uconn.edu/siegle/research/Correlation/corrchrt.htm
There are two Python packages that can do the t-tests, including looking up the table values, for you:
Doing linear regression in Python: http://www2.warwick.ac.uk/fac/sci/moac/currentstudents/peter_cock/python/lin_reg/