Data Desk (hosted)
A tool for Exploratory Data Analysis (EDA). It is one of the oldest Macintosh programs still actively developed and sold (for OS X and Windows). A version for Macintosh 680x0 is freeware.
My favorite program for simple calculations.
"General purpose graphing scientific calculator."
"For graphing, and otherwise exploring, mathematical relationships."
"Full-featured replacement for Apple's standard Calculator DA.
Calculator with hot key activation.
Extended Calculator (hosted)
Four calculators in one program.
"Scientific plotting and statistics".
Linear Regression Pro v2.2
copyright: Gerald Hammond, MacSOS
mod date: Jan 28, 1999
An "application to calculate the slope, intercept, the correlation coefficient and the errors for a series of x, y data. (i.e. y=mx+b)" The "maximum number of points is 40".
copyright: Dan Velleman
mod date: Mar 16, 1995
license: free for non-commercial use
"Writes outlines of proofs in elementary set theory, under the guidance of the user. It is designed to help students learn to write proofs". Dan Velleman requested (9/20/2004) mention that an applet version (Java) is also available.