This is an updated blog post. I previously removed one of the websites I featured because it was no longer a free site.
I would recommend this free interactive website above for your students to get fun practice with fraction matching. Just click on the picture to take you there.
This is a free fraction number line app from iTunes.
The webpage lets the user make a pizza fraction that is equivalent to the fraction given. The rest of the site is loaded with other fraction games for fraction number lines, adding, subtracting, multiplying and dividing fractions, converting to decimals or percents, and more.
If you want to share about a free fraction online tool that has worked well for your class, feel free to suggest it in a comment below.