These are links to several fraction applets I have designed

Fraction Circles
2 fraction circles
2 fraction circles with drag-able totals
small: 2 fraction circles
small: 2 fraction circles with drag-able totals
All in one: all of the above on the same page
Fraction bars
2 fraction bars
2 fraction bars with drag-able totals
small: 2 fraction bars
small: 2 fraction bars with drag-able totals
All in one: all of the above on the same page
Discrete fractions:
A fraction modeled as a subset of a discrete set.
Small: fraction modeled as a subset of a discrete set
Both: both of the above on the same page
Fraction Rectangles and Squares
2 fractions modeled as subsets of rectangles:
small
medium
large
2 fractions modeled as subsets of squares
small
medium
large
All in one: all of the above on a single web page.