My name is Chris Makler. I've taught econ classes at the University of Pennsylvania, Drexel University, Foothill College, and currently at Stanford University, and worked as the Senior Economist for Aplia, back when all Aplia did was econ. :)
I've created econgraphs.org as an open source project to provide econ teachers with a standard set of interactive graphs they can use in classes. It's heavily tilted toward the graphs I use in my own classes, which are intermediate micro classes with calculus. I use Hal Varian's Intermediate Microeconomics: A Modern Approach in my teaching, so the notation matches that book.
Most of the graphs here are actually sets of linked graphs -- for example, individual and market demand, or total and marginal costs for a firm -- so that econ teachers can illustrate the important underlying relationships within an economic model.
Comments and suggestions are very much appreciated; send me a note at chris dot makler at gmail dot com.
Note that I develop and test using Google Chrome; while the site works on any modern browser, Chrome will provide the most predictable results.
I am trained as an economist, not as a software developer; and this project would not have been possible without the mentorship of an outstanding group of friends and colleagues over the years, including (but certainly not limited to!) David Murphy, Karl Lew, Wilson Cheung, Harrison Caudill, and Kyle Moore.
Design work for the web site was generously contributed by Jørgen Veisdal.