A Must Have for Sound Engineers

AUM - Audio Mixer v1.2
3oomph v1.0
AudioMaster Pro: For podcasts and music v1.6
AUFX:PeakQ v1.2.2
FAC Chorus v1.2
Goose EQ v1.0
Italizer v1.0
Korvpressor - smart dynamic hotdog device v1.1.1
MicSwap Pro v1.8.1
RP -1 v1.3.1
Rough Rider Z v2.0.309
Ringabell AU v1.0
Rf-1 v1.1
Shaper : smart audio destroyer v1.0.1
soundfruuze v1.0.1
Svep- phaser chorus flanger v1.1.1
VirtualRoom AU v1.0

A Must Have for Composers

AUM - Audio Mixer v1.2
Beatonal - Easy Music Maker v2.1.1
Elastic Drums v2.0.3
ChordFlow v1.2.0
FluXpad v1.0.8
Jubal Flute v1.0.1
KRFT - Modular Music Production v1.6
modstep v1.3.2
Navichord - Chord Sequencer and MIDI Controller v2.6.1
PixiTracker 1bit v1.5c
PixiTracker 1bit v1.5c
SessionBand Acoustic Guitar - Volume 1 v1.0
Xynthesizr: 32-step matrix sequencer/synthesize v1.5

A Must Have for Virtual Drummers

AUM - Audio Mixer v1.2
Arturia iSpark v1.0.2
DM2 The Drum Machine v1.5.2
Elastic Drums v2.0.3
Funk Drummer v3.02
KRFT - Modular Music Production v1.6
Patterning Drum Machine v1.3
Ruismaker FM v2.0.2
SeekBeats Drum Machine Synthesizer v1.02
V Drum PRO v1.0
WerkBench v3.1.0

A Must Have for Guitar Players

Capo touch v2.5.1
AUM - Audio Mixer v1.2
FAC Chorus v1.2
FuzzPlus 3 v3.0.0
Guitar Tabs X: editor of guitar and bass tablature v1.3
MicSwap Pro v1.8.1

A Must Have for Keyboard Players

AUM - Audio Mixer v1.2
Alina String Ensemble v1.1.2
Artic Keys v1.2.3
Clawtar - Adaptive MIDI Controller v1.1.0
Enkl - monophonic synthesizer v1.1.2
Mersenne Synthesizer v2.0.0
Mood v1.0.2
KRFT - Modular Music Production v1.6
Ribbons Expressive Electronic Instrument v1.2
Shoom Synthesizer v1.0
Super Manetron v1.4.1
SyndtSphere v1.0
Tines - Electric Piano v1.0.2
Troublemaker v1.4.4

A Must Have for Children

SoundForest v1.0

A Must Have for Live Perfomances

Auto Chord v2.3
AUM - Audio Mixer v1.2
Chordpolypad - Chords Player v1.0

A Must Have for Training

Beat On - Advanced Metronome with Training Modes v1.0

A Must Have for Photographers

Noir Photo v2.2.3

A Must Have for Video's Editors

AudioFix Pro: For Videos v1.0