1)   Advanced Grapher 2.11
Graphing, curve fitting and calculating software. Graphs Cartesian, polar and parametric functions, graphs of tables, implicit functions and inequalities. Calculus features: regression analysis, derivatives, tangents, normals and more.
graph, graphs, regression, plotting, curve, fitting, analysis, plot, function, equation,

 2)   Difference Between Two Dates Software 7.0
Find the number of years, months and days between two dates.
subtract, date, time, year, month, day, days, years, months, calculate,