Optiboot (an older version) is installed by default on the Arduino Uno and (as of 2018) official Arduino Nano boards. It can be installed on all older mega8, 168 or 328 based Arduinos. As of 2019, ...

I built a whole-home ad blocker with a $7 ESP32-S3 board - and it took just minutes ...

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I didn't expect to love it, and it has a learning curve, but the possibilities are endless.