Free42 HP-42S Calculator Simulator is an Open Source recreation of the HP-42S Scientific Programmable Calculator and HP-82240 Printer. Plus42 is also available.
Graphing Calculator 3D is an advanced high-quality 3D graphing calculator that enables you to plot any number of mathematical equations or coordinates.
Alternate Math Solver is a freeware tool to solve equations that contain a variable X towards this variable. The resulting equation will look like X=...
Proportional Calculator allows you to scale an object proportionally, given the height and width of an object and one or more limiting factors ( square footage, max-height, or max-width).
Learn to solve equations step-by-step while gaining a better understanding of fundamental concepts in pre-algebra, algebra, trigonometry, physics, chemistry, and calculus.
Kalkules is a universal scientific freeware calculator with some nontraditional functions, useful for anyone but particularly for high school and university students.
Past is free software for scientific data analysis, with functions for data manipulation, plotting, univariate and multivariate statistics, ecological analysis, time series and spatial analysis, morphometrics and stratigraphy.