There's one good source of manipulatives, the Toy Theatre set, and one out-of-date one, the National Library of Virtual Manipulatives (NLVM). The difference between them is that the NLVM requires that you download and install an application. That makes it needlessly complex for use in a classroom or on students' own computers, and anyway, in these days of powerful web technologies, a separate application is completely unnecessary. But it does point to a problem with a lot of free online learning content: so much of it depends on Java or Flash applets that are today recognized as security risks and no longer supported.
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