Just Hardware

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Arduino

Arduino is an open source electronics platform that is great for both adults and kids.

https://www.arduino.cc/

Snap Circuits

Snap Circuits is a great electronics learning platform consisting of plastic board and electronics components that you snap together based on project guides to learn basic electronics concepts.

Project Bloks (in development)

Project Bloks is on the web at https://projectbloks.withgoogle.com/ and is a new project from Google that is still being developed but looks pretty awesome if you have younger kids that want to learn logic and flow.