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Please find and list (with product name and URL) the top 25 most popular commercial and the top 25 most popular open source educational training kits for teaching analog electronics, digital electronics and microcontroller-based systems to students in high school and college. I am particularly interested in kits that are modular in nature, where the same basic kit can be used to teach different levels by just changing some modules. Here's one example of such a kit: http://www.electronickits.com/kit/complete/science/sc300.htm
Please keep in mind that I am interested only in educational kits that are used to teach electronics and microcontroller related subjects, such as the kit described at www.ni.com/nielvis. Regarding open source educational training kits for electronics, one example is the Arduino microcontroller, which is often used for educational purposes and the design of which has been released as open source.
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