I don't believe gear is the defining factor in what makes a good record. This is an incomplete and always evolving list of the things i use the most when mixing and mastering.  

Software

Reaper

Protools

DSP Quattro

Universal Audio

Waves

Slate

Soundtoys

Hardware

Universal Audio Apollo 16

Universal Audio Apollo Twin

Universal Audio LA-610

Neumann KH120

Sony MDR 7506

Slate VSX