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Calculators
http://www.image-ination.com/test_maker/calc.html
Scientific calculator
http://www.sonic.net/~undoc/webcalc.html
Uses the Javascript eval() function to evaluate whatever expression you type in.
Graph Plotters
http://wims.unice.fr/~wims/wims.cgi?session=ABA1EAA6&lang= en&module=tool/analysis/function.en&cmd=new
Function calculator
http://www.shu.edu/projects/reals/classes/tools.html
Applets used to illustrate various topics, including function plotter, root finder and derivative checker, options include interactively defining and applying parameters
http://wims.unice.fr/wims/wims.cgi?session=1D772A856B.2& lang=en& module=tool/analysis/function.en
Function calculator
http://wims.unice.fr/~wims/wims.cgi?session=3512B499&lang=en& module=tool/geometry/animtrace.en
Plot curves and surfaces in 2D and 3D, zoom, deform and/or rotate in all directions.
3D Graph Plotters
http://wims.unice.fr/~wims/wims.cgi?session=150F978C&lang=en&module=tool/geometry/polyray.en
Uses technique of ray tracing to plot algebraic surfaces
Roots of Equations
http://members.tripod.com/~kselva/quad.html
Solving quadratic equation
Series Expansions and Sequence Summations
http://www.sunsite.ubc.ca/LivingMathematics/ V001N01/UBCExamples/Plot/calc.html
Maclaurin and Taylor expansions with graphs
http://wims.unice.fr/~wims/wims.cgi?session= EA27E7E4&lang=en&module=tool/analysis/sigma.en
Sigma summation
Simultaneous Equations and Matrix Operations
http://www.mkaz.com/math/js_lalg3.html
Linear equation solver
http://wims.unice.fr/~wims/wims.cgi?session=153CA497&lang=en&module=tool/linear/matrix.en&cmd=new
Matrix calculations
Integration
http://www.integrals.com
Ability to calculate integrals powered by mathmatica
Pure Mathematics Miscellany
http://wims.unice.fr/~wims/wims.cgi?session=245E8EC9&lang=en&module=tool/number/primes.en
Primes search tool
http://puzzlemuseum.com/
Puzzle museum featuring practical or mechanical puzzles