Kind of a broad question but I'll throw a few out there... I'll usually grab BF1176 for a vocal or if I want to smash something up like a drum room or whatever. I also like the LA2A and Fairchild 660, which I use a lot without even compressing as it will fatten/warm things up just by being there.
If there's a difficult to tame problem(or sometimes on the master bus) I'll use Waves C4 but it's quite a cpu hog! McDSP MC4000 gets used in a similar way if I'm concerned about cpu.
Here's one that's maybe not so obvious... McDSP AC1. I'll use the console emulation quite a bit but it also works well as a subtle-ish bus comp for parallel type stuff and it's my current go to for Parallel drums and instruments. Also their AC2 (tape emulation) gets used a LOT and functions as subtle compression/fattening.
I REALLY like the Sony compressor but I don't currently have a working copy '(.
T-Racks tube comp and limiter emulations can be pretty juicy too!
I use Metric Halo Analog Channel quite a lot (mostly for eq) but I'll usually try the comp as long as it's on there but it's hit or miss for me.
Well that's what jumps to mind