Software

Guitar Tuna
This is the free tuner app I use in our lessons. Also has some good games which help with learning and memorising chord shapes

Guitar Pro
This is the tab/notation software I use

Jam Tracks
A useful app for playing along with backing tracks

Drum Beats +

Voice Record
A voice recorder I often record lessons with

https://www.ronimusic.com
Slows down audio files for accurate transcriptions