Hardware & software:
- AllTrails at https://www.alltrails.com for free (and $2.99/month option) from Andy Ihnatko.
- ZoomISO at https://www.liminalet.com for $29/month (lite) and $45/month (pro) from Alex Lindsay.
- Wigetsmith at https://apps.apple.com for free (an up) from Jason Snell.
- izi Travel at https://izi.travel for free from Leo Laporte.