ECMNET - Elliptic curve factoring software. CLN - Class Library for Numbers - C++ library by Bruno Haible. Multiprecision Software Directory - Fortran multiprecision software by David H. Bailey of Lawrence Berkeley Lab. Implementations of Extended LLL - By Wilberd van der Kallen. KANT / KASH - 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. ARIBAS - 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. Maple Worksheets by John Cosgrave - A selection of Maple (V.5) worksheets for teaching purposes. NTL: A Library for doing Number Theory - 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. Math Archives Software - PC/Number Theory section. MIRACL - Multiprecision Integer and Rational Arithmetic C/C++ Library. Schulenberg and Associates - Factoring programs. Windows, free download. Number-Theoretic Hacks - Algorithms implemented by David Eppstein. Aliquot - A DOS tool to compute aliquot chains with small starting numbers, by Ivo Düntsch. Java PHASER Project - An application for numerically and graphically analyzing dynamical systems. apfloat - High-performance arbitrary precision arithmetic package for C++ and Java. CALC - 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. GNUBC - 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. Magma Computational Algebra System Home Page - A large, well-supported software package for computationally hard problems in algebra, number theory, geometry and combinatorics. Encyclopedia of Integer Sequences Seeker - 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. Kaprekar Series Generator - A java application for determining the Kaprekar Constants and Series for numbers in various radixes. p-adic Arithmetic - A Mathematica package by Stany De Smedt. Large Number Arithmetic in BASIC - Library for large-integer arithmetic, plus some number theory modules. cBigNumber - Portable C++ class for integers with unlimited range, designed to be fast, functional and simple in use. SIMATH - Computer algebra system for number theoretic applications. NZMATH - Python based number theory oriented calculation system, developed at Tokyo Metropolitan University. Downloads, mailing list. ZEN - A toolbox for computation in finite rings, by Florent Chabaud and Reynald Lercier. ANSI-C source, free download, GPL.