WolframAlpha: Computational Knowledge Engine
WolframAlpha
WolframAlpha Mathematics Examples by Topic
WolframAlpha's Knowledge Base

Khan Academy
http://www.khanacademy.org/



Online Calculators
Instacalc (also creates charts)
http://instacalc.com
Calcr (basic calculator only - powered by Instacalc)
http://instacalc.com/calcr
e-Tutor Graphing Calculator
http://www.e-tutor.com/et2/graphing
FrakKalk: Fraction Calculator (download for Mac only): add, subtract,
multiply, and divide large fractions without having to
convert from decimal form.
http://goldfishsoft.com/frakkalk.html
EdenMath: Scientific Calculator (download for Mac only): a scientific calculator which does
standard arithmetic, probability, and trigonometric functions.
http://www.edenwaith.com/products/edenmath
EdenGraph: (download for Mac only) a graphing calculator- plots two-dimensional
graphs using standard algebraic and trigonometric functions.
http://www.edenwaith.com/products/edengraph
Calcoolate (Also available as a download for Windows machines.)
http://www.calcoolate.com
Create a Graph (creates five kinds of graphs)
http://nces.ed.gov/nceskids/createagraph
GCalc: use GCalc2 applet for online calculating
http://gcalc.net
GCalc: use GCalc3 to use the Java calculator
http://gcalc.net

Spreadsheets
Google Spreadsheets (create google acccount first)
http://docs.google.com
EditGrid: With majority of Excel features,
EditGrid allows you to start working easily.
https://www.editgrid.com
Zoho Sheet
http://www.zoho.com



Math TED Talks

Dan Meyer


Conrad Wolfram


Salman Khan


Blogs
Math Apps for iPad Blog http://ipadarena.com/math-apps-for-ipad/
Comprehensive list of Math Blogs by academics
Wolfram Blog - http://blog.wolfram.com/
Wild About Math - Sol Lederman - http://wildaboutmath.com
dy/dan - Dan Meyer - http://blog.mrmeyer.com/
f(t) - Kate Nowak - http://function-of-time.blogspot.com/
Math Stories - Mr. Knauss - http://blog.mathpl.us/?page_id=12
God Plays Dice - Michael Lugo - http://godplaysdice.blogspot.com/
Ars Mathematica - http://www.arsmathematica.net/
Casting Out Nines - Robert Talbert - http://castingoutnines.wordpress.com/
Data Mining: Text Mining, Visualization and Social Media - Matthew Hurst - http://datamining.typepad.com/data_mining/
Freakonomics Blog - Steven D. Levitt and Stephen J. Dubner - http://www.freakonomics.com/blog/
Infosthetics - Andrew Vande Moere - http://www.infosthetics.com/
The Unapologetic Mathematician - John Armstrong - http://unapologetic.wordpress.com/
The Wall Street Journal: The Numbers Guy - Carl Bialik - http://blogs.wsj.com/numbersguy/