Statistics modules in Perl Data Language, with a quick-start guide for non-PDL people. They make the PDL shell work like R, but with PDL threading (fast automatic iteration) of procedures including t-test, linear regression, and k-means clustering.
Console based notepad number cruncher makes calculations fast and simple, yet with ample features under the hood. With log turned on, you can record your session on-the-fly from any open instance of the program.