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I'm teaching a class on ordinary differential equations (ODE). What's a nice website where students can easily type in a first-order ODE and an initial value and get a graph of the solution?
I'd prefer a program that uses the Euler scheme, because it's easy to explain, and I'd prefer it if you can choose the step size. But the most important thing is ease of use.
We have Mathematica on the math department computers, and our math majors can in principal use that, but for a class of 90 this is not very practical: it would overwhelm the rather small facilities. Also, it would require teaching them a bit of Mathematica, which would steal from the limited time we have for this.
Another possibility is the Khan Academy computer science website---see for example this program. If I (or you) could write the desired program here, everyone in the world could use it---and if they register, also modify it and make new versions.