 Snowdays  Popular Front
Make your own snowflakes online: point and click to cut anywhere around or inside the folded piece of virtual paper. Preview the unfolded results in real time; when ready, save your design to the searchable gallery, where you may view and download plans
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 Softmath  Neven Jurkovic
Developers of Algebrator, an automated tutor based on Maxima CAS that provides stepbystep solutions to algebra, trigonometry, and statistics problems, and exports answers to MathML. Demo and purchase Algebrator; use Softmath's free online software to
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 SoftSchools.com  Mani Gudavalli
Free math worksheets and interactive online games for practicing times tables, adding, subtracting, telling time, and more. Organized into prek, kindergarten, grades 12, grades 34, grade 5, measurement, and fun games.
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 Software and Animations (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of pointers to specialized software, Java applets, video sequences, and other forms of interactive or animated geometry.
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 Software  Bill White
These Flash apps provide online practice deriving some unknown property of a figure given its other measures. Find the area of a trapezoid given its two base lengths and height; find one of its bases given its area and height; find its height given its
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 Software by Al Jarnow  ProtoZone Interactives
Webbased interactive software excerpted from pattern exhibits at the Long
Island Children's Museum, the National Museum of Science and Industry (London),
and the Brooklyn Childrens's Museum. Introductions to art and math with many patternmaking
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 Solve for n  NASA Lewis Learning Technologies Project
Solve for n: 3/n = 7/12. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 Solve for y  NASA Lewis Learning Technologies Project
Solve the following for y: 12y  16 = 20y. A detailed answer is provided. From NASA's 9th Grade Math Proficiency Test.
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 SolveMe Mobiles  Education Development Center, Inc. (EDC)
Colorful interactive hanging sculpture puzzles that challenge prealgebra and algebra students to balance equations by solving for unknown values. Freely solve over a hundred prehung mobiles or build your own and then contribute them to the SolveMe community.
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 Solve My Math  Solvemymath
Online math integrals calculator, derivative calculator, function grapher, math formulas and facts, math quizzes and puzzles.
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 Solve This!  ThinkQuest 2003
Information about eight famous mathematicians, with interactive quizzes, static problems and games.
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 Solving Quadratic Equations  Prakash Sukhu
Introduces the general form of the quadratic equation, and shows how to solve the quadratic equation step by step. Includes methods of factorisation and completing the square, questions to test your knowledge, and an online equation solver with which
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 Some Variations on the Theme of Polyominos  Recmath
Patterns that illustrate how the squares of polyominos are connected to each other. Examples of polyominos with a grid superimposed to illustrate the individual squares; with a line that joins the midpoint of two adjacent square if the squares are connected.
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 So Much Data  William D. May
Based on the book So Much Data, So Little Math, tools for learning to do simple data analysis on data sets. Features the online calculation tools "Easy Correlation Calculations" and "Easy Trend Prediction," with explanations, as well as an example of
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 Soroban in Various Number Systems  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A Java simulation of Sorobanthe Japanese analogue of the traditional abacus and the Chinese Suan Pan. This is the most economical tool of the three.
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 Source Panel Integrals / Java Matrix Solver  Marc Gerritsma, Jamie Grier
The source panel integrals Javascript can be used to calculate the integrals and the matrix elements of the source panel method (see sec 3.17 of Fundamentals of Aerodynamics, 2nd edition, by J.D. Anderson, jr.). The Java matrix solver can be used to solve
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 SpaceTime  Chris and Stephen DeSalvo
SpaceTime develops mathematics software for personal digital assistants (PDAs) and other mobile devices such as Pocket PCs, Palm Pilots, and smartphones. Play JavaScript and Flash games in the arcade: ArithmeTick, Math Scramble, Math Mountain, Snake,
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 Spatialised Prisoner's Dilemma: Evolution Simulator  Wayne Davis
Spatialised version of the Iterated Prisoner's Dilemma game theory that allows the users to set their own strategies and simulate evolution of strategies: Coded in Javascript by Wayne Davis.
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 Special Functions in WolframAlpha  Michael Trott
Special functions describe a large number of phenomena in mathematical physics and other disciplines. Michael Trott posts here about WolframAlpha's treatment of these functions. In particular, there are some with two forms: a simpler version that makes
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 Speed Math Trainer  Jimmy Ruska
Flashbased, very tiny file size, speed math program including a Google video tutorial. Watching the video tutorial is highly recommended as the program can be tricky to use. Free for redistribution and potentially useful for anyone wishing to increase
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 Spherical Geometry Demo  John M Sullivan, University of Illinois
An applet demonstrating several features of spherical geometry, among them the parallel transport of tangent vectors, and the fact that the angles of triangles may not sum to 180 degrees.
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 SPIMSOW: Swarthmore Summer Project for the Implementation of Mathematical Software on the Web  Bouttenot, Parlikar; Mathematics & Statistics Dept., Swarthmore College & Math Forum
The product of a 1998 summer project investigating current Weboriented mathematical software. The site explores the capabilities of the new Web versions of Mathematica, Maple, and MathView, offering tutorials on configuring the software and creating
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 Spirograph  Anu Garg
A Spirograph is formed by rolling a circle inside or outside of another circle. The pen is placed at any point on the rolling circle. This applet has changeable colors as well.
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 Spliddit  Procaccia, Ariel; Goldman, Jonathan
Provably fair solutions to the everyday dilemmas of splitting rent, dividing goods, and sharing credit. Spliddit's algorithms account for individual rationality, efficiency, maximin share, proportionality, the highest feasibility level of fairness, impartiality,
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 Spreading Memes  Cut the Knot!, Alexander Bogomolny
First of a series of interactive columns for MAA Online that use Java applets to simulate a puzzle or mathematical problem, one not stated directly since the applets are intended to be such that the right answer to an as yet unstated problem should be
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 Spy Guys: Online Elementary Mathematics Resource  Mathematics 6  LearnAlberta.ca
This Flash 5 site includes lessons (Decimals; Improper Fractions and Mixed Numbers; Ratio; Percent; Solving Problems with Decimals; Understanding Integers; Factors, Multiples, and Prime Factorization; Summarizing and Extending Patterns; Rounding Numbers;
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 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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 Square Root Calculator  Mimi Stern
Free JavaScript and apps calculators of square and cube roots of positive integers.
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 Star Fractal  Pierre Dufilie IV
A Java Applet displaying the Mandelbrot fractal set using exponential color smoothing. The program allows the user to zoom in and out of the fractal in the complex plane.
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 Starship Maths  BBC Learning
Six different interactive games, with accompanying resources for teachers and parents, designed for students ages 57: Place the Penguins  Cross the Swamp  Calamity's Quest  Park the Pods  Alien Cookbook  Number Jumbler. Print and Do, Teachers, Parents.
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 StatApplet  Marcus Kazmierczak
A simple statistics program and a short outline of the underlying mathematics. The statistics applet calculates the sample mean and sample standard deviation, and constructs a 95 percent confidence interval for data values entered.
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 StatiBot: Your expert system for inferential statistics  Dominik Heeb
An interactive tool for data analysis. Enter your data by hand or copy them from another program, then answer a series of questions. StatiBot will perform appropriate statistical tests, comment on test results, and create graphs. Site includes example
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 Statiscope  Mikael Bonnier
Statiscope presents summarizing data and descriptive statistical charts. In the applet you can enter data manually or download data over the Internet. Charts included: Distribution, Probability mass, Density, Box plot, Stem & leaf; also other features
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 Statistical Thinking for Managerial Decision Making  Prof. Hossein Arsham; University of Baltimore
Course description: Statistical summary measures, probability, random variables and their distributions: estimation and hypothesis testing, correlation and regression analysis, ANOVA, and their applications to business problems will be presented, and
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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 Norway
The agency that collects Norwegian statistics. Includes articles about data, tables of recent economic and population statistics, and list of publications; many publications and research papers may be read or downloaded in PDF format. The site also
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 Statistics Online Computational Resources (SOCR)  Ivo Dinov
Interactive Java applets for undergraduate and graduate students learning about variation, modeling, visualization and data interpretation. The most prominent are an applet used to explore different distributions, and a collection of different probabilityrelated
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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 To Use  Thomas W. Kirkman; College of Saint Benedict and Saint John's University
A tutorial on: Mean, Standard Deviation; Student's tTests; chisquare distribution test; contingency tables; Fisher Exact Test; ANOVA: ANalysis Of VAriance between groups; Ordinary Least Squares; Ordinary Least Squares with Plot option; Beyond Ordinary
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 Statistics: Unlocking the Power of Data  Lock, Robin; Lock, Patti Frazer; Morgan, Kari Lock; Lock, Eric F.; and Lock, Dennis F.
Companion materials for the Wiley textbook Statistics: Unlocking the Power of Data. See in particular StatKey, JavaScript for descriptive statistics and graphs, bootstrap confidence intervals, randomization hypothesis tests, sampling distributions, and
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 Statistics with Java  Mehmet Hakan Satman
Statistical applets for clustering, integrals, normal distribution, ordinary least squares, least median of squares regression, analysis of variance, bootstrapping, simplex solving, active ball regressors, random walk and white noise processes, and "Monkey
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 Stat Trek
Free, online tutorial covers basic statistics, probability, distributions, sampling, estimation, and hypothesis testing. Includes online calculators, sample problems with solutions, and glossary of statistical terms.
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 Stef's HTML Equation Generator  Stefan Waner
A utility that generates math symbols and equations for web pages. The Equation Generator also allows editing of the HTML output. No plugins necessary; no need to create gifs for entire equations. Download Mac or PC versions; or use an online Javascript
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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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 The STEM Collaborative  Maryland Public Television, Arkansas Educational Television Network, Alabama Public Television, and Kentucky Educational Television
The four online adventures Scale City, ProportionLand, Math by Design (architecture), and Rock 'n Roll Road Trip (music) engage students to use geometry, algebra, and proportional reasoning for skateboard ramps, cooking, amusement park roller coasters
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 Stephen P. Booth
A researcher working in physics and parallel computing. Articles and source  code for random number generation (parallel generation and a generic Fortran90 interface), and the xmountains program, which uses fractals to generate computer images of landscape.
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 Steven Strogatz
Research, teaching, publications and more by Strogatz, Jacob Gould Schurman Professor of Applied Mathematics at Cornell University. Best known in the academia for his 1998 Nature paper on "smallworld" networks, which he coauthored with his former student
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 The Stock Market Game  woodydrn
Create a company, hire its staff, build its board, and see how it does in the marketplace. If you can convert your companies to a business park, you may win the game.
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 StocksQuest (Thinkquest 1998)  Connie, David, Joseph
An educational, interactive site offering free global stock games, especially for educators and contest organizers. Integrated into a realistic global stock market simulation are lesson plans, stock guides, and online investing resources.
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