Hardware & software:
- Mackup at https://github.com/lra/mackup for free from Leo Laporte.
- Apollo for Reddit (iOS) for free from Rene Ritchie.
- Taming the Terminal Podcast at https://podcasts.apple.com for free from Lori Gil.
- Taming the Terminal eBook at https://www.podfeet.com for free from Lori Gil.