 Handy Math  Roseller Sunga
The website provides practical online calculators for technicians to use, from doityourselfers to chemists.
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 HAN Software  Luckhan.com
HAN Software develops mathematics and engineering applications, for Windows platforms. Their mathematical products include a matrix calculator (easy and pro models), a curve fitting application, and a visual Kalman filter.
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 Harry O'Malley
Blog by a math teacher who believes "... that learning to use mathematics changes people's lives in profound and valuable ways," and describes himself as "obsessed with making that happen for people. I am convinced that recent advancements in technology
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 HartMath  Java Computer Algebra Applet  Klaus Hartlage
HartMath is a computer algebra system available free under GNU public license. It features large number arithmetic, symbolic derivatives/integration, linear algebra, plot functions, numeric functions, patternmatching rules, and pure functions, and runs
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 Highland Tessellations  Karen M. Stagge, Highland Middle School, Libertyville, IL
Tessellations A La Escher: an introductory unit based on MECC's Tesselmania! software and the graphics of M.C. Escher, to help students realize the importance of mathematics in the art world. Also links to work done by students at other schools.
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 HIME: Huge Integer Math and Encryption Library  DevOTechS
Big number software library (dll) for huge integer mathematics. For encryption and number theory applications. This library also contains encryption functions for public and secret key encryption applications, hash functions, random number generators,
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 Homepage of Keith Matthews  Dept. of Mathematics, Univ. of Queensland, Australia
Matthews is a Senior Lecturer whose professional interests are number theory, teaching, and traversing the World Wide Web to uncover things of interest to number theorists for the Number Theory Web. Links to mathematical interests, gateways (mainly mathematical)
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 Horazio's Educational Freeware  Horacio Vilches
Featuring a quiz program, and Equation Lab, for Windows. Equation Lab is a simple program that helps the user to work with single variable equations. You can add, multiply, and solve the equations.
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 The house of Mathematics software  Akihiro Akitsu
Math '98 for Windows, free software to download. Topics include the Mandelbrot set; Complex numbers; Dragon curve; Tree curve; Koch curve; Peano curve; Pascal's triangle; and the Sierpinski gasket. In English and Japanese.
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 How To Excel  John MacDougall
Tips, tricks, tutorials, templates, keyboard shortcuts, a free ebook and video course, and more datarelated resources for mastering Microsoft's spreadsheet application. A former theoretical math student and former actuary, MacDougall describes himself
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 How to use a Chinese Abacus: A ComputerBased Tutorial  Jan G. Hogle
An abacus helps make abstract math concepts more concrete. This site includes a softwarebased tutorial to illustrate the basic use of an abacus. The tutorial presents a brief introduction; and illustrates, with graphics, text, and animation, how to represent
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 HULL  A program for convex hulls  Ken Clarkson
Hull is an ANSI C program that computes the convex hull of a point set in general (but small) dimension. The input is a list of points, and the output is a list of facets of the convex hull of the points, each facet presented as a list of its vertices.
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 Hyperbolic Geometry (Graphics Archive, Special Topics)  The Geometry Center
A definition of hyperbolic geometry and illustrations of hyperbolic structures, with a link to Not Knot, a guided tour through computeranimated hyperbolic space.
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 HyperCuber  Greg Ferrar
A Java applet that lets you rotate a fourdimensional cube in four dimensions. HyperCuber is a freeware program for 680x0based Macintosh computers that displays and rotates wireframe objects of arbitrary dimension, like hypercubes (fourdimensional cubes).
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 HyperGami and JavaGami  Ann & Mike Eisenberg; Inst. of Cognitive Science, Univ. of Colorado, Boulder
HyperGami and JavaGami are software environments for designing and building paper sculpture. Choose from a number of starting polyhedra, which appear in a 3D window alongside a corresponding "folding net" in a 2D window. Employ both builtin features
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 Hypergami (Geometry Forum Summer Institute)  Michael Eisenberg, Ann Nishioka
A program for the creation of paper sculptures of various types  particularly polyhedral models and the larger, multipart sculptures that can be created from polyhedra. Description of a Geometry Forum Institute program (summer 1995).
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 Hypothèses / Géometrix  J. Gressier
Logiciel capable de corriger en direct un élève sur n'importe quel problème de construction géométrique. Il peut aussi le corriger sur la plupart des problèmes de démonstration en géométrie
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 IDEA: Internet Differential Equations Activities  Thomas LoFaro; College of Sciences, Washington State Univ. (WSU)
Interdisciplinary computerbased activities for differential equations: a database of computer activities illustrating both mathematical concepts and the application of these concepts in a wide variety of disciplines. DynaSys, Java differential equations
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 iFD Bundle  iFD Software Consult
Five mathematical products for Pocket PC and Windows in one software package: iFD Geometry, iFD Graph, iFD Calc, iFD Formula, and iFD unit converter. All products available separately as well, in addition to other software applications.
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 IFS Construction Kit  Larry Riddle
IFS Construction Kit is Windowsbased software that can be used to design and draw fractals based on iterated function systems. The program consists of three main windows. The IFS Window is where you can see and edit the code for the transformations that
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 IFS: Fractal Image Compression  Pulcini, Verrando, Meloni Rossi
Download IFS Application Framework, a freeware educational program for fractal image coding. Note: It needs 486DX2/66, 8MB RAM, Windows 3.1 with a 11MB swapfile and a 32000 SVGA driver (at least). Download IFSDOC, an introduction to IFS and IFSAF (in
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 The Image Warper (METIP)  Steve Tanimoto; Mathematics Experiences Through Image Processing
A PC program for MSWindows that supports exploratory learning and enjoyable activities involving geometric transformations and image distortion. Simple transformations such as rotation, translation or scaling can be specified with single line segmentss.
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 Infinity Calendar  Y. Kirani Singh
This program determines the day of the week given the date of any year, no matter the magnitude, in the Julian or Gregorian calendar.
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 INFORMS OR/MS Resource Collection
 Michael Trick, Carnegie Bosch Inst., Grad. School of Indust. Administration, Carnegie Mellon Univ.
An organized listing of sites concerned with the field of operations research, the technique of using modern scientific models to predict and compare the outcomes of complex systems, considering factors such as change and risk, with links to: FAQs; Societies;
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 Institute for Scientific Computing and Applications (ISCA)  Alfred K. Louis
Software and algorithms for linear and nonlinear inverse problems: computerized tomography, wavelet applications, statistical computations, multiparameter fit, and more. Site is in French and German.
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 Institute for Theory Testing  Fred Dansereau
The Institute offers a software package (DETECT) that researchers (usually in psychology, social psychology, sociology, management, business, economics, political science, and communication) use to decide whether
individuallevel data should be aggregated
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 Institute for the Study of Adult Literacy (ISAL)  Penn State University, College of Education
ISAL stresses the importance of connecting research to improving practice. Resources include software, publications, consulting services, and Web links.
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 Interactive Excel Spreadsheets  Scott A. Sinex, Prince George's Community College
"Excelets are interactive Excel spreadsheets or simulations of mathematical models. The user changes a variable and the spreadsheet changes in numerical, graphical, and/or even symbolic form (equations).... with no use of programming, no macros or Visual
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 Interactive NonEuclidean Geometry  Carlos CriadoCambon and JuanCarlos CriadoAlamo
Draw in Euclidean and spherical geometries  as well as the four most popular models of hyperbolic geometry: Klein, Poincaré, halfplane, and hemisphere. This freeware lets you define points, lines, segments, and circles; analyze distances, angles,
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 Interactive Statistical Calculation Pages  John C. Pezzullo
Links to free statistics software, online statistics books, tutorials, downloadable software, and related resources. Selecting the right kind of analysis; online software package websites; calculators, plotters, function integrators, and interactive programming
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 The InterFACE: Internet Fractal and Chaos Education  ThinkQuest 1997
Lessons, games, activities, demonstrations, and software, to inform users of the science and mathematics behind fractal images and chaos theory. The lessons, identified by subject and level of difficulty and including quizzes, are designed to promote
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 International Society on Multiple Criteria Decision Making (MCDM)  Ralph E. Steuer
The Society's purpose is to develop, test, evaluate, apply methodology for, help managers and other people solve, and to foster interaction and scientific research in the study of multiple criteria decision problems, and to cooperate with other organizations
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 Interval Arithmetic for ADA  Dmitry A. Kazakov
A free (GPL) implementation of interval computations in Ada.
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 Interval Computations
What is Interval Arithmetic?; Languages for Interval Analysis; Numerical Toolbox for Verified Computing (information on the book and software; in German and English): Pascal and C++ versions; Interval Software; Roundings Necessary for Interval Computations;
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 Introduction to Symmetries  Chaim GoodmanStrauss; The Geometry Center
Studying symmetries called isometries, which preserve distances. Pattern and symmetry appear in virtually every human culture. Symmetry surrounds us, both in the natural world and in the world of human artifact... the arrangement of needles on a pine
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 Introduction to Wallpaper Patterns  Chaim GoodmanStrauss; The Geometry Center
A unit on about plane patterns whose symmetries are translations, glide reflections, and rotations. Learn how to use a computer program called Kali which generates plane patterns; create and save a design, then learn the definitions of some features of
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 Investigating Patterns: Symmetry and Tessellations  Jill Britton
Thirty activities from a variety of Web sites, coordinated with a forthcoming book by Jill Britton for Cuisenaire/Dale Seymour, Exploring Pattern: Symmetry and Tessellations (March 1999). Topics include an introduction to symmetry; symmetry in the alphabet,
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 IOSO Technology Center
Technology for numerical optimization. IOSO (Indirect Optimization on the basis of SelfOrganization) Technology is based on response surface techniques and differs significantly from wellknown approaches to nonlinear programming. The proposed optimization
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 IQ Wealth Calculators  Brent Hecht
Interactive calculators, some with FAQs: loans, refinancing, income, credit card payoff, rates of return, yield to maturity, net worth, payback periods, Roth vs. Traditional IRAs, charitable remainder unitrust (CRUT), tipping, the rule of 72, and more.
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 Isabelle  Paulson, Nipkow
A generic theorem proving environment developed at Cambridge University and TU Munich. Isabelle/HOL is currently the best developed object logic, including an extensive library of (concrete) mathematics, and various packages for advanced definitional
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 Isard  JeanSébastian Roy
A free dynamic geometry program for Windows, PowerMac, and Linux. Like Cabri, but in Smalltalk (and smaller). The source is available and may be extended as needed.
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 IsarMathLib
IsarMathLib is a library of proofs that have been checked with Isabelle
proof assistant, based on the Isabelle's ZF logic. The emphasis is put on
readibility. The proofs are written using Isar syntax and can be read and
followed by any person familliar
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 IsoDraw  Mervin Bitikofer
IsoDraw is downloadable freeware for Windows machines that allows students to play on a drawing space with polygons and various isometries. They can place and move multiple reflection lines on the screen, and watch the effects of translations and rotations.
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 Iterated Prisoners' Dilemma  Delayaye, Mathieu, Beaufils
A comprehensive source of information on the Iterated Prisoner's Dilemma, and on the representation, study of, and knowledge about cooperation (and evolution of cooperation) between agents. Strategies, references (papers in English and French, bibliography),
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 Janet Bowers  Janet Bowers
Current research projects, such as investigating multimedia case studies as a tool for preservice teacher development, the MEASURE project (SimCalc  San Diego), and reforming the preparation and professional development of elementary and middle school
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 Java PHASER Project: A Universal Simulator for Dynamical Systems  Jason Glick, Huseyin Kocak, Burton Rosenberg
A largescale standalone Java application for graphically and numerically analyzing dynamical systems on a computer. Phaser is designed as a professional research and educational tool, and is being tested in beginning and advanced courses in differential
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 Java Square Cell  Brian Prentice
Download source code for a 2D cellular automata Java simulator and a large collection of patterns, including about a hundred rules that support knight ships.
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 JB Programming  Jim Burke
Logic.xla, a free Excel logic processor addin for symbolic logic and mathematics.
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 JeoEdit  Grundland, Toussaint; Computational Geometry Lab, School of Computer Science, McGill University
The JeoEdit package, consisting of the JeoEditPoints and JeoEditPolygon applets, is a set of Java visual editors designed to help the computational geometry community realize its algorithms and theorems on the Internet by providing an
interface for drawing
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 JMP: Statistical Discovery Software  SAS Institute
This program presents statistics in a graphical environment. Data tables are presented clearly in spreadsheet form and are dynamically linked to related graphs and tables. JMP offers six statistical analysis platforms including a 3D spin plot, as well
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