Helpful Cellphone Apps

• Camscanner is a useful app that uses a cellphone camera to take a picture of a document, and then crops and sharpens the image and turns it into a PDF file. This is very useful for students who need to submit homework electronically. It is helpful to the instructor, because when the instructor receives a PDF of the homework, it is easy to add comments (link to Camscanner web page)

General Websites

• Wolfram Alpha is a truly amazing site (link)

Function Evaluators:

• Function Evaluator and Grapher (by Stefan Waner) (link) (very simple and flexible interface: You enter a function or multiple functions into a web form. Then you can either enter an x-value or multiple x-values into a web form to produce a table of values, or you can plot a graph.)

Graphing Utilities :

• GraphSketch (by Andy Schmitz) (link) (very simple and flexible interface, easy to graph multiple equations or parametric equations, zooming done by typing into a form)
• Meta-Calculator (link) (very versatile, clear interface on multiple pages)
• Desmos Calculator (link) (versatile, but not immediately obvious how to use, user can save graphs by setting up a free account or linking to a Google account)

Calculus

• Secant and Tangent Line Grapher (on Desmos Calculator)(EXCELLENT) (link)
• Secant and Tangent Line Grapher (by David Little of Penn State)(Getting browser to run this webg page is a pain!) (link)
• Derivative Grapher (by David Little of Penn State) (link)
• Riemann Sums Calculators
  • on the MathWorld web site (link)
  • on the Geogebra site (link)

Regression Calculators

• Xuru's Regression Calculators let you paste data in from a spreadsheet. The result is a list of coefficients. (link)
• Arachnoid's Regression Calculators lets you paste data in from a spreadsheet. The result is a list of coefficients and a graph. (link)
• Had To Know's Regression Calculators lets you type (x,y) data directly into a web form. The result is a list of coefficients. (link)

Online Calculators for solving systems of equations

• System of Equations Solver (from the Solve My Math web site) Simple interface, but the asterisk * is necessary for multiplication. (link)
• Algebra Solver (from the Quick Math web site) Also a simple interface. The asterisk * is not necessary for multiplication. (link)

Geometry

• Geogebra (link)
• NonEuclid (link)
• Wilson Stothers' Geometry Pages (link)