Compressors/Limiters:
Density MK III. - I use this on the drum bus. It's easy to use and does a good job of gently "gluing" the drums together. I'd say this compressor on the drum bus might be my secret weapon.
Black Rooster VLA-2 and 3 - These are "vintage" compressor/limiters. I like them a lot on vocals. I don't even know how or where I found these things, but they're fucking great.
Antress Modern Series - The Modern Compressor and the Lost Angel. Again, modeled after famous analog shit, the LA2A. Good for damn near anything. Easy to use.
ReaComp - stock standard Reaper compressor. Works good, looks terrible. I'll use this whenever for whatever, but not that often.
Blockfish - No idea where I got this goofy thing, but it works great on kicks and snares.
Waves V-Comp. Good for bass or drum overheads/room mics, don't use it for much else.
Waves L3 - Basic transparent brickwall limiter
Voxengo Elephant - Another brickwall, pretty good mastering limiter. Quite transparent.
EQ:
ReaEQ. Another stock standard Reaper plug-in, and honestly, I don't see how an EQ can be any better than this thing. Good parametric EQ.
Kjaerhus Classic EQ - This is a basic graphic EQ. Not too useful, but I put it on the master bus and work the sliders to see what, if any, ranges need to be addressed in the mix.
Reverb/Delay:
I use convolution reverb impulse files almost exclusively. I have tons of them.
Reaverb - Stock Reaper convolution reverb host. It also works for cab sims, or any impulse file.
SIR - Convolution reverb host, looks terrible, very functional and tweakable.
Glaceverb - The only stand-alone reverb plug I use, and I love it for percussion like tambourines, handclaps, foot stomps, etc.
Kjaerhus Classic Delay - Good for vocal slap-back, tempo matching, very adjustable, sounds and works good. Good for automation too.
Other shit I sometimes use:
Voxengo Span Spectrum Analyzer. It is exactly what the title says.
Waves MetaFlanger. Great flanger for guitars, bass, or across anything in a mix. Don't use it often, but it's a cool effect sometimes.
ReaGate - Stock Reaper noise gate for when I don't feel like snipping out lip smacks or tom-tom rumbles.
Antress Modern Analoguer - A "tape saturation" plug in. Not my favorite effect, but it sounds good on vocals or bass.
Transient Monster - I have no idea where I got this, but I've had it a very long time. It's a transient shaper, kind of like a weird compressor. I only use it on snare drum close mic tracks. It really helps bring out attack or body in a snare drum track. It's good for bottom snare tracks too to help with some snare snap and sizzle.
And....that's really about it. If you went in to one of my mixes, this is about all you'll ever see.
Let's see what yall got. I'm open to try some new stuff out.
Even when I decide to sell one to finance another, somehow I'll pull off getting the new one, and won't be able to part with the previous one. Oh well, they all have their own unique character. 
