Hardware & software:
- MailMate at https://freron.com for $49.99 from Leo Laporte.
- Calligraphy Handbook – Nguyen Tan Hon-Hu (iPad) for free (with in-app purchases) from Alex Lindsay.
- BBEdit at http://www.barebones.com for $49.99 from Andy Ihnatko.
- The ASL App – Ink & Salt LLC (iOS) for free from Rene Ritchie.
- GPG Suite at https://gpgtools.org for free from Leo Laporte.