The Wolfram Demonstrations Project
The only downside to this site is it doesn’t run off a browser: it requires the free Mathematica Player. If you’re at a place that doesn’t allow outside programs on their computers, it will be an issue.
However, if you can run the software, you get a selection far wider than any other storehouse of virtual manipulatives. Here are three:
The Definition of the Derivative
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The Number Warrior 
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