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	NTL: A Library for doing Number Theory - http://www.shoup.net/ntl/ 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.
	Magma Computational Algebra System Home Page - http://magma.maths.usyd.edu.au/ A large, well-supported software package for computationally hard problems in algebra, number theory, geometry and combinatorics.
	http://www.loria.fr/~zimmerma/records/ecmnet.html - http://www.loria.fr/~zimmerma/records/ecmnet.html Elliptic curve factoring software.
	CLN - Class Library for Numbers - http://www.ginac.de/CLN/ C++ library by Bruno Haible.
	http://www.cdc.informatik.tu-darmstadt.de/TI/LiDIA/ - http://www.cdc.informatik.tu-darmstadt.de/TI/LiDIA/ C++ Library For Computational Number Theory.

	KANT / KASH - http://www.math.tu-berlin.de/~kant/kash.html 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.
	http://tnt.math.metro-u.ac.jp/simath/ - http://tnt.math.metro-u.ac.jp/simath/ Computer algebra system for number theoretic applications.
	Multiprecision Software Directory - http://crd.lbl.gov/~dhbailey/mpdist/mpdist.html Fortran multiprecision software by David H. Bailey of Lawrence Berkeley Lab.
	http://indigo.ie/~mscott/ - http://indigo.ie/~mscott/ Multiprecision Integer and Rational Arithmetic C/C++ Library.
	Number-Theoretic Hacks - http://www.ics.uci.edu/~eppstein/numth/ Algorithms implemented by David Eppstein.

	http://www.numbertheory.org/calc/krm_calc.html - http://www.numbertheory.org/calc/krm_calc.html 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.
	http://www.mathematik.uni-muenchen.de/~forster/sw/aribas.html - http://www.mathematik.uni-muenchen.de/~forster/sw/aribas.html 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.
	Implementations of Extended LLL - http://www.math.uu.nl/people/vdkallen/lllimplementations.html By Wilberd van der Kallen.
	http://fchabaud.free.fr/English/ZEN/ - http://fchabaud.free.fr/English/ZEN/ A toolbox for computation in finite rings, by Florent Chabaud and Reynald Lercier. ANSI-C source, free download, GPL.
	http://www.apfloat.org/ - http://www.apfloat.org/ High-performance arbitrary precision arithmetic package for C++ and Java.

	Math Archives Software - http://archives.math.utk.edu/software/msdos/number.theory PC/Number Theory section.
	Math Archives Software - http://archives.math.utk.edu/software/mac/numberTheory/.directory.html Mac/Number Theory section.
	http://tnt.math.metro-u.ac.jp/nzmath/ - http://tnt.math.metro-u.ac.jp/nzmath/ Python based number theory oriented calculation system, developed at Tokyo Metropolitan University. Downloads, mailing list.
	http://pmmac03.math.uwaterloo.ca/~mrubinst/L_function_public/L.html - http://pmmac03.math.uwaterloo.ca/~mrubinst/L_function_public/L.html A C++ class library, datasets and command line program for computing zeros and values of L-functions, by Michael Rubinstein.
	MAGMA/PARI Calculator - http://modular.fas.harvard.edu/calc/ Web interface for short programs in either language.

	Number Field Sieve NET - http://www.iaeste.dk/~henrik/projects/nfsnet.html A client/server system for NFSNET by Henrik Olsen.
	http://archives.math.utk.edu/software/msdos/dynamics/aliquot/.html - http://archives.math.utk.edu/software/msdos/dynamics/aliquot/.html A DOS tool to compute aliquot chains with small starting numbers, by Ivo Düntsch.
	http://www.numbertheory.org/gnubc/gnubc.html - http://www.numbertheory.org/gnubc/gnubc.html 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.
	Factorizer - http://www.hermetic.ch/factors/factors.htm 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.
	Schulenberg and Associates - http://www.schulenberg.com/ Factoring programs. Windows, free download.

	Kaprekar Series Generator - http://kaprekar.sourceforge.net/ A java application for determining the Kaprekar Constants and Series for numbers in various radixes.
	Java PHASER Project - http://www.math.miami.edu/~phaser An application for numerically and graphically analyzing dynamical systems.
	Maple Worksheets by John Cosgrave - http://www.spd.dcu.ie/johnbcos/Maple.htm A selection of Maple (V.5) worksheets for teaching purposes.
	Large Number Arithmetic in BASIC - http://largeint.sourceforge.net/ Library for large-integer arithmetic, plus some number theory modules.
	Encyclopedia of Integer Sequences Seeker - http://sourceforge.net/projects/eisseeker 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.

	p-adic Arithmetic - http://library.wolfram.com/infocenter/MathSource/556/ A Mathematica package by Stany De Smedt.
	cBigNumber - http://www.imach.uran.ru/cbignum/ Portable C++ class for integers with unlimited range, designed to be fast, functional and simple in use.
	http://modular.fas.harvard.edu/SAGE/ - http://modular.fas.harvard.edu/SAGE/ 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.

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