I spend a lot of time traveling & recording in random locations, so ADPTR's Metric A/B is great for referencing other mixes/songs when I may not trust the acoustics of my environment.
The BX Townhouse Buss Compressor is my go-to mix buss compressor to glue the mix together before I add saturation, refinement, & final limiting.
The versatility of switching EQ/Compressors in a single channel strip like the Lindell 50 allows for a quick workflow in fast-paced recording environments.
I love using the BX Refinement plugin near the end of my Pro Tools vocal buss to tame harshness and add presence with the saturation knob.
The MaagEQ4 is great for adding high frequencies in a musically-pleasing way that isn't too harsh on the ears. The sub knob is fantastic for adding weight to vocals without making them boxy.