MpNT is a multi-precision number theory library that provides a base for building cryptographic applications. It may also be used in any other domain where efficient large number computations are required. The library supports integer, modular, and floating point arithmetic with practically unlimited precision. It is both speed efficient and highly portable without disregarding code structure and clarity.
OpenCalculator is a Java-based calculator program. It can calculate mathematical expressions. It has a module system that makes it very easy to add your own functions. Other features are a graph painter and a tiny programming language designed to make it easy to write small mathematical tools.
CElect is a console-based tool for determining a social preference ordering, such as an elected candidate or choice in a single-winner election, or the preferred composition of a multi-member council, based on a list of individual preference orderings (ballots) over the candidates or choices. It can also calculate the winner and social ordering when given a Condorcet matrix and list of candidates, though it is in that case limited to Condorcet methods. Of single-winner methods, it supports Dodgson, Simpson, Tideman/wv, first and second-order Copeland, and Schulze (all Condorcet methods), and FPTP, Borda, 1/n Borda, Hare, Nanson, and 1/n Nanson. Of proportional representation, it supports CPO-STV, CFPRM, and D'Hondt without lists.
galculator is a GTK 2/GTK 3-based scientific calculator supporting algebraic mode, RPN, and formula entry mode. Features include arithmetic operations plus precedence handling, full keypad support, trigonometric functions, power, square root, natural and common logarithm, constants (e, PI), and inverse and hyperbolic functions. It supports different number bases (decimal, hexadecimal, octal, and binary) and angle bases (radiant, degree, and grad).