OpalCalc is a brand new type of calculator for the PC.

Helps you solve common machine shop math problems.

Free mathematics software for learning and teaching.

Talking Calculator is designed to be a simple, easy to use calculator for home or in the office.

Simple freeware that breaks down the number of prime factors

Boolean Minimization, Logic Design, Simulation, Permutations & Random Numbers

Free, flexible scientific calculator for Windows users

In SimplexNumerica you can analyze data with a broad range of computing and numerical methods on a Microsoft Office like interface.

Random Number Generator Pro is a Windows based application designed to
generate random numbers.

Graphmatica is a powerful, easy-to-use, equation plotter with numerical and calculus features

kCalculator is a simple calculator and text editor that has been designed to be intuitive to use.

Freeware fractal generator

pRPN is a Graphical Reverse Polish Notation calculator for multiple platforms.

Write and edit mathematical equations as easily as possible

Quick and easy to use calculator that lives in the notification tray