Hardware & software:
- Princeton IoT Inspector at https://iot-inspector.princeton.edu for free from Leo Laporte.
- One Switch (Mac app) at https://fireball.studio for $4.99 from Andy Ihnatko.
- Logitech Slim Folio Pro for $129.99 (Amazon Affiliate Link) from Lori Gil.
- SNOWW (iOS) at https://snoww.com for free from Rene Ritchie.
- Trident Underwater Drone for $1695 (Amazon Affiliate Link) from Oliver Breidenbach.