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, ...

Pi-hole is a DNS sinkhole that protects your devices from unwanted content, without installing any client-side software, intended for use on a private network. It is designed for use on embedded ...