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Article from The Colorado School of Mines regarding calculator use in their college courses.

WebGraphing.com delivers real-time, step-by-step answers to challenging mathematics problems. There are a number of unique, patent pending features that make our calculators easier to use and more powerful than other graphing calculators. In comparison, our calculators take more of the grunt work out of demanding computations that contribute very little either to student learning or teacher productivity.

A bit pricey, but cheaper than a stand-alone calculator.

Instacalc is a nice shareable calculator that can be embedded into a site. Also, a user can create colored charts and look up formulas which is an excellent feature of most spreadsheets.

Awesome Web 2.0 calculator.

Calculation Nation™ uses the power of the Web to let students challenge opponents from anywhere in the world. At the same time, students are able to challenge themselves by investigating significant mathematical content and practicing fundamental skills. The element of competition adds an extra layer of excitement.

Site from Australia on calculating your environmental footprint

Question types for Moodle quizzes.