Always at hand, UltimaCalc is compact and can stay always on top, transparent when not active. Simplify algebra expressions, integrate, differentiate, factorise polynomials. Evaluate algebraic expressions, define your own functions and constants. 200,000,000 prime numbers. Least Squares (5 methods); Standard Deviation; Plot functions; Solve Triangles; Simultaneous Linear/Nonlinear Equations; Polynomial Roots; table of constants; much more.