These are plugins that I run regularly and without issue in x64. They either have a fully native x64 version or work properly under BitBridge 2.0.
All UAD Plugs
All the Ohmforce stuff (Ohmboyz, Frohmage, etc)
NI Komplete 6 (x64 versions)
IK Classic Studio Reverb
IK Amp sims (2, Hendrix, SVX, etc)
G-Media M-Tron 2
Kjaerhus Classic Series (free)
TruePianos (full x64 version)
Spectrasonics Trilogy
East West StormDrum, Bosendorfer, and EWQLSO
There's also lots of little things like Chameleon, Glitch, the dfx stuff, delaylama, Orca, CM101, etc...all work great.
I've actually found very little that won't work under BitBridge 2.0