You mean, besides my ears?

 

Mastering Console:
Manley Mastering Backbone
Hendyamps “Monet” Custom Line Amp

Converters:
Apogee Symphony MkII 16x16 SE
LynX Hilo
Antelope Pure2
Dangerous Convert-2

Hardware Dynamics:
Thermionic Culture phoenix Mastering Plus
Manley SLAM!

Hardware Equalizers:
EAR 825q
Manley Massive Passive Mastering Edition
Dangerous BAX EQ
HENDYAMPS Michelangelo

Metering:
TC Electronic Clarity M

Monitoring:
Genelec 7.1.4
KIi Three Stereo
Kali Audio IN-8 Stereo
GRace M905 Monitor Control

Headphones:
Audeze LCD-X

Digital Audio Workstations:
Reaper
WAVELAB
Pro Tools
Pyramix
izotope RX
HOFA
Dolby Atmos Album Assembler

Plugins:
Tone Projects
Metric Halo
Plugin Alliance
FabFilter
iZotope, Oxford
DDMF, Slate, OEKSOUND