Receive an email notification every time your Public IP Address changes. The Public IP Address Check script is a free and easy to use PowerShell script that can be ran as a schedule task using Task Scheduler within Windows.
Infection Monkey is an open-source, network penetration testing tool. It is a breach and attack simulator that uses real attack techniques and vulnerabilities.
Arduino is an open-source electronics platform. A good way to get started is with a starter kit like the Elegoo Starter kit contains everything you need.
Caffeine is a free tool by Zhorn Software that prevents your computer from sleeping or locking. Caffeine works by simulating a keypress once every 59 seconds.