Apps

Apple -

Metronome -

Metronome+ - Dynamic App Design

Pro Metronome - Beat with Sound and Light

Metronome - Onyx Apps

Metronome - MarketWall.com

Tuner -

InsTuner Lite - Chromatic Tuner - EUMLab of Xanin Tech

Pro Tuner Lite - Chromatic Tuner - Amir Markish

Rudiments -

Rudidrum Lite - COI Inc.

Drum Set Training - 

Drum Guru

Free Sheet Music - 

Chromatik

Note Reading - 

Staff Wars - $0.99

Windows -

Metronome -

Metronome

Metronome+

Pulse Metronome

Tuner -

modTuner

Note Reading -

Music Notes

Android - 

Metronome - 

Digital Metronome - JoeAverage

Metronome Beats - Steonkick

Tuner and Metronome - onsquare

Tuner - 

Fine Chromatic Tuner - FinestAndroid.com

Tuner and Metronome - onsquare

Rudiments - 

Rude - Drum Rudiment Training - Skrivarna Software

Vic Firth - Vic Firth

RowDrum - Drum Rudiments - Rowforce

Drum Set Training - 

Drum Guru

Note Reading - 

Music Tutor (Sight Reading) - JSplash Mobile. 

Staff Wars - $0.99