Offered by Autodesk, Tinkercad is a free online platform you can use to build and test out your Arduino circuits. This way, you can start learning even without the components on hand.

so tinkercad has circuit designand arduno now, a real arduino is $20, IDE is free, fritzing is free and does all the exact same layout stuff locally, you save your files and keep them forever.

It’s technically a Nokia smartwatch. The watch itself runs off an Arduino board, and manages to fit a Bluetooth module and 3.7v battery into the 3D-printed watch case.