 Square Root Calculator  Chris Misenheimer
This interactive square root calculator calculates the square root of positive, negative, imaginary, and complex numbers, rounded to seven decimal places. Short articles include "Square roots and area," "Square roots without a calculator," and "What does
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 StatAssist: Distribution Calculator & Grapher  Mathwave Technologies
StatAssist displays all types of distribution graphs and properties, and allows users to generate random numbers from any distribution, within specified parameters. For Windows; free trial available.
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 Statistical Education through Problem Solving (STEPS)  STEPS TLTP Consortium
The STEPS consortium in the U.K. has developed problembased modules to support the teaching of Statistics in Biology, Business, Geography, (Windows) and Psychology (Windows and Mac). The software is freely available to educational institutions, and can
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 Statistica  StatSoft, Inc.
A comprehensive, integrated statistical data analysis, graphics, database management, and custom application development system featuring a wide selection of basic and advanced analytic procedures for science, engineering, business, and data mining applications.
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 Statistics101: Resampling  John Grosberg
Software for statistics and probability, it can be used to teach concepts via simulation. It can also be used for real bootstrap, Monte Carlo and simulation applications. Runs on any platform supporting Java 1.4.2 or better.
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 Statistics Resources  Econometrics  Forecasting  Resa Corporation
Concepts, formulas, and online software of descriptive statistics, continuous distributions, econometrics, and time series analysis (forecasting). Descriptive statistics covered include central tendency, concentration; box plots; density trace; moments;
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 Statistics Tutorials  TexaSoft
Brief explanations of the use and interpretation of standard statistical analysis techniques. Examples are given using the WINKS program (for Windows). Pearson's Correlation Coefficient; Simple Linear Regression; Single Sample ttest; Independent Group
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 StatistikTutorial  Peter Schill
Guidance on statistical problems and the use of software packages such as SPSS. More, including forums, available in German.
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 stella2java  Shodor Education Foundation, Inc.
Use Stella2java to make Java applets out of the modeling software package Systems Thinking Experimental Learning Laboratory with Animation (STELLA). Copy and paste your equations from Stella into a web form, answer a few questions, and download your applet.
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 STELLA  isee systems
A model building and simulation software package. Read about STELLAbased materials such as Lessons in Mathematics: A Dynamic Approach. Get help with STELLA training, seek live support building a model, see tutorials, purchase supporting books and videos,
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 Stella: Polyhedron Navigator  Robert Webb
"Small Stella" is a program for viewing polyhedra and printing their nets so you can build your own. It has over 150 builtin models, plus their duals. Models include Platonic solids, Archimedean, KeplerPoinsot, Johnson solids, "Near Misses," and Stewart
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 STEM On Mobile
Makers of educational apps for iPad and Android tablets such as Geometry Pad and Constructions Tutor. Watch demo videos, read the developers' blog, and more.
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 Stereograms: A COOL Application of Geometry  David Eger
Images that look like TV static, but if you look at them in a certain way, 3D pictures "pop out" at you. Download StereoGrinder (a Java program) to create stereograms; to see them do not look at the paper or screen on which the stereogram lies, but beyond
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 Steven M. Christensen and Associates, Inc.  Steven M. Christensen and Associates, Inc.
Offers scientific computing consulting and program development for corporations and universities. Also distributes Schur, a group theory software for handling calculations with Lie and symmetric groups; and Sunfreeware.com, the Solaris Freeware Project.
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 Stochastic Differential Equation Software  Yin Mei Wong
Commercial software for numerical solution of stochastic differential equations, for Windows, Linux, and Unix machines.
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 Stochastic Lab  Denis Kozyr
Shareware and freeware math tools include the Smart Monte Carlo Excel addin, the thirteen functions of which generate random numbers with a certain distribution using the Monte Carlo method; Archim, which graphs functions based on explicit parametric
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 Stone's Free Mac Programs  Ishihama Yoshiaki
Free Mac software and images illustrating dynamical systems: applets (see the 4D Rubiks Cube), fractal generators, etc. Topics include artificial life, AfterDark modules, cellular automata, chaos, fractals, graphics, hyperdimension, genetic programming,
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 StradivariSecrets.com  Dmitry Badiarov
Violin drawing tutorial and software based on application of early acoustics to violin making.
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 SturmLiouville Problems: SLEIGN2  Bailey, Everitt, Zettl, Garbow
A code to compute eigenvalues and eigenfunctions, and to approximate the continuous spectrum of regular and singular SturmLiouville (SL) problems. These problems consist of a second order linear differential equation (py')' + qy = (lambda) w y on (a,b)
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 SuanShu  Haksun Li
An objectoriented numerical library of methods for building engineering software, conducting research, or prototyping. SuanShu shares many algorithms in common with Netlib and other public domain libraries, but has advanced them through refactoring
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 A Su Doku solver
Solvers for sudoku puzzles, with documentation, source code, and binaries. Frequently asked questions about this numeric puzzle include "Su Doku" or "Sudoku"? How does the solver work? How do I compose a Su Doku problem? How few cells could appear on
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 SumTree Order of Operations Calculator  Martin Bradley
SumTree is a shareware program designed for parents and teachers as an educational tool which will interest children in arithmetic and illustrate the correct order to work out sums.
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 Syllogism 1.0  Ben Sharvy
Software to download. Enter a syllogism of any length. The program will tell you whether it is a valid syllogism, and if not, why not. It will also analyse the links between terms in the syllogism. BASIC code, and a version compiled for the Mac.
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 SymmeToy  Hank Hufnagel
A Windows program for creating paint patterns, symmetry roses, tessellated art, and symmetrically decorated 3D polyhedron models. The program is easy to learn, fun to use and includes extensive online help. Appropriate for all ages, but especially for
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 Symmetrica  Lehrstuhl Mathematik II, University of Bayreuth
A collection of routines, written in the programming language C, for doing computations in the representation theory of classical and symmetric groups, and related areas. With a list of papers that mention Symmetrica, and a collection of online programs
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 Symmetry Studio 1.01  Binkley, Simon; Artware, Inc.
Symmetry software for mathematics and art, for the Macintosh. A computeraided design tool that allows you to quickly create complex twodimensional symmetrical patterns. It simplifies the study and use of mathematical principles that underlie the regular
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 System Simulation: The Shortest Route to Applications  Prof. Hossein Arsham; University of Baltimore
Course notes. Information includes: Course Information (for students enrolled in the class); Topics in Descriptive Simulation Modeling; Statistics and Probability for Simulation; SIMSCRIPT, and SPSS Commands; Techniques for Sensitivity Estimation; Goalseeking
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 Tanzzle™  Franco Cocchini
Software for exploring tangrams. View published patterns and/or submit one of your own. Request a free license for schools and educational programs. Free 30day trial; free viewer download. Choose from four different sets of pieces: Tangram (traditional
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 Teacher's Pal
Designs, produces, and markets software and related products for curriculum development and lesson planning. Software includes CurriculumMaster (designed to help you plan and implement standardsbased curricula) and LessonMaster (designed to support lesson
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 Teaching Geometry with Google SketchUp  Bonnie Roskes
3DVinci's resources for teaching geometry with this 3D modeling application include projects of the month, videos, teacher resources and guide, 2D and 3D project books, a blog, geometry tips and projects, and much more. Google originally created SketchUp
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 Teaching Resources Online  Bert G. Wachsmuth
Seton Hall University professor's syllabi, online handouts, sample programs, scripts and software to download, exams and answers, general information, and other teaching resources for his computer science and mathematics courses: Intro to Computer Science,
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 Terrapin Software  Terrapin Software
Terrapin Logo sells Logo products and other educational software and Logo materials, such as Mission Control, Crystal Rain Forest, and Roamer World. Take a quick lesson in Logo programming; learn about robotics powered by Logo, such as Universal Robotics
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 Terry McConnell's Home Page  Terry McConnell, Mathematics Department, Syracuse University
Download PDFs of tests given in McConnell's introductory calculus, Math 295. "Stuff" ranges from a remark on average velocity and an expository paper showing the details of how to derive the second order correction to the period of a plane pendulum using
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 Tess  Pedagoguery Software
A shareware program for creating symmetric planar illustrations. With Tess, while you draw you can automatically maintain the symmetry group you have chosen; 11 rosette, all 7 frieze, and all 17 wallpaper groups are included. Illustrations may be printed
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 ThinkNum  Gregory Ugwi
A webbased financial data analysis engine. Use regression, curve trades, and other quantitative trading algorithms from scipy, numpy, and similar open source libraries to analyze economic information from hundreds of sources ranging from the ADO National
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 TI85 Programs  John Lindsay Orr; Dept. of Mathematics & Statistics, Univ. of NebraskaLincoln
Integration programs include Riem (calculates a numerical value for the Riemann sum approximation of the definite integral of a function), Circumscribe (calculates an approximation of the definite integral of a function using circumscribed or inscribed
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 Tiled CA  Brian Prentice
An interesting variation on the traditional 2D Cellular Automata simulators, for Windows.
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 TileDreams  ZayanteCreek Solutions
Explore geometry, color, symmetry, and design by creating mosaics, tessellations, mandalas, and other designs. View galleries and submit your own TileDreams designs; read the user manual and software reviews; and download a trial demo, or purchase a license
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 Tiletris  Oktay Haracci
A tiling program for aperiodic or periodic tiling. Freeware, for PCs only, running Win 9x/2000. Help, including instructions, available on the site.
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 Time Zone Converter  David Svenson
Enter multiple cities, countries, or time zones, and this JavaScript plots them on a timeline that reveals their temporal differences. Slide the circled "host" marker through business hours, evening, past midnight, night, and morning.
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 TI Wizard  Andrew Munsell
News, software, and tutorials for Texas Instruments calculators. Download board games, roleplaying games (RPGs), racing and driving games, shooter games, games of strategy, platforms, shells, puzzles, and more. Stepbystep Flash tutorials include "Transferring
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 Tools for Exploring Mathematics (TEMATH)  Mathematics Dept., UMass Dartmouth
A software package useful for learning and teaching algebra, precalculus, calculus, linear algebra, and applied mathematics, with a graphical interface that makes it easy to use for the computer novice. Information about TEMATH, a tour of the programs,
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 Topical Index of Internet Resources (The Chaos Hypertextbook)  Glenn Elert
An extensive list of links to sites related to Elert's Chaos Hypertextbook. Major categories include: Chaos (Dynamical Systems); Dimension; FAQs; Feigenbaum Constants (Bifurcation Diagrams); Fractals; Image Compression; Iterated Function Systems (IFS);
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 Tostaky.Biz  Jerome Verstrynge
JavaScript utilities formatted for the smaller screens of tablets and smartphones: timer, stopwatch, world clocks, and other timekeeping tools; and unit converters for area, force, length, torque, weight, and more.
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 A Tour of Fractions  Math Forum
The Web often seems more like a maze than an organized set of resources. To help you find what you need, the Math Forum presents a 'tour' of fractions, offering links to lessons, activities, and materials, questions and answers from Ask Dr. Math, and
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 Trachtenberg Basic Multiplication Tutorial  Moshe Berlin
TracMath is a freely downloadable tutorial (MS Windows) for the basic system of Trachtenberg Multiplication. This system teaches a set of algorithms that perform the same function as the times tables. When students ask "How does it work?" you can use
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 Trachtenberg Speed Math  Alpha Centauri Software
Software that teaches Jakow Trachtenberg's speed system of basic mathematics that he invented while imprisoned by Hitler during WWII. For Windows only. Demo version available.
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 Transparent Media  Transparent Media, Inc.
Commercial software company offering shareware software for fraction exploration, as well as other free downloads and commercial products.
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 TreeAge Software, Inc.
Producer of decision analysis software. Product information, interactive demos and trial download, FAQ and technical support, ordering, and registration.
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 Triangle: A TwoDimensional Quality Mesh Generator and Delaunay Triangulator  Jonathan Richard Shewchuk
Triangle generates exact Delaunay triangulations, constrained Delaunay triangulations, and quality conforming Delaunay triangulations. The latter can be generated with no small angles, and are thus suitable for finite element analysis. Instructions for
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