Interactive
Shodor Education Foundation

Shodor Interactivate: Fraction to Decimal Converter

For Students 3rd - 8th Standards
This is a handy little applet that lets you convert a fraction to a decimal or decimal to fraction. It can handle proper and improper fractions.
Unit Plan
Wyzant

Wyzant: Fraction Simplifying Calculator

For Students 9th - 10th
This WyzAnt applet allows the user to input fractions--improper or mixed numbers--and have the calculator reduce the fraction or convert it into a mixed number. A good resource for checking students work.