A DOS tool to compute aliquot chains with small starting numbers, by Ivo Düntsch.

High-performance arbitrary precision arithmetic package for C++ and Java.

An interactive interpreter for big integer and multi-precision floating point arithmetic with a Pascal/Modula like syntax. It has several builtin functions for algorithmic number theory.

A library of functions to handle arbitrary length integers, written on ANSI C99.

A calculator program for doing arbitrary precision integer arithmetic, written in ANSI C and Yacc, with a number of built-in functions for number theory, by Keith Matthews.

C++ library by Bruno Haible.

Elliptic curve factoring software.

EIS-Seeker is a libguile-based scheme interpreter devoted to the study of the Encyclopedia of Integer Sequences database. It is intended to help find new relations between sequences. C/Scheme, Posix.

A Windows program to find all factors of any positive integer less than 2^31 - 1; decompose numbers into their prime constituents; find prime numbersand pairs of primes; and to plot Erdos-Kac and Palmen Color histograms. Down load free demo, order full version online.

In the Number Theory Web.

An algebra/number theory package by R. Lidl, R. W. Matthews and R. Wells.

Library of routines for large integer arithmetic and number theory.

About the Mersenne Prime Freeware.

Free library for arbitrary precision arithmetic.

Supports arbitrary precision integer arithmetic calculations with interactive execution: it is a superior version of the basic bc program which comes with the UNIX operating system. Keith Matthews has written several number-theoretic programs.

Home of PIOLOGIE, a library for arbitrary precision arithmetic, operating on natural, integer and rational numbers.

By Wilberd van der Kallen.

An application for numerically and graphically analyzing dynamical systems.

Large integer arithmetic.

KANT is a software package for sophisticated computations in number fields and in global function fields. With KASH you are able to use the powerful KANT V4 functions within a shell.

A java application for determining the Kaprekar Constants and Series for numbers in various radixes.

A C++ class library, datasets and command line program for computing zeros and values of L-functions, by Michael Rubinstein.

Library for large-integer arithmetic, plus some number theory modules.

C++ Library For Computational Number Theory.

A large, well-supported software package for computationally hard problems in algebra, number theory, geometry and combinatorics.

Web interface for short programs in either language.

A selection of Maple (V.5) worksheets for teaching purposes.

PC/Number Theory section.

Mac/Number Theory section.

Freeware to search for Mersenne Primes. Pointers to FreeLIP, GMP, HFloat, apfloat, CALC.

Multiprecision Integer and Rational Arithmetic C/C++ Library.

Fortran multiprecision software by David H. Bailey of Lawrence Berkeley Lab.

A high-performance, portable C++ library providing data structures and algorithms for manipulating signed, arbitrary length integers, and for vectors, matrices, and polynomials over the integers and over finite fields.

A client/server system for NFSNET by Henrik Olsen.

Algorithms implemented by David Eppstein.

Python based number theory oriented calculation system, developed at Tokyo Metropolitan University. Downloads, mailing list.

A Mathematica package by Stany De Smedt.

Download site for number theory programs adapted from UBASIC/MALM for the TI-92.

System for Arithmetic Geometry Experimentation: a framework for number theory, algebra, and geometry, initially designed for computing with elliptic curves and modular forms, by William Stein. Open source under GPL.

Factoring programs. Windows, free download.

Computer algebra system for number theoretic applications.

Links maintained by John Cremona.

A toolbox for computation in finite rings, by Florent Chabaud and Reynald Lercier. ANSI-C source, free download, GPL.