This is not an exhaustive list, just what I tend to use a lot of.
DAW: Reaper (I'm a Reaper lifer, for whatever flaws it has the sheer customization ability makes it my forever DAW)
Instruments
Spectrasonics: Omnisphere, Trillian, Keyscape (I use these a ton, every project, 100% guaranteed)
Native Instruments: Kontakt (I have more Kontakt libraries than I can count, for better or worse it's the industry standard)
Best Service: Engine2 (worse than Kontakt but the Eduardo Tarilonte libraries are amazing)
For drums, a combination of Stylus RMX, Battery 4 and Geist 2, Slate for rock/metal.
Other than Omnisphere, some of my frequently-used synths: Sylenth1, z3ta+ 2, VB3 for organs
Sample devs I really like: Heavyocity, Impact Soundworks, Eduardo Tarilonte, Orange Tree Samples, Soniccouture
Effects
MeldaProduction: MFreeFXBundle (fantastic value for money, I mostly use the EQ and compressor), MUltraMaximizer, MAutoDynamicEQ, MTurboReverbLE
VallhallaDSP: Room, VintageVerb, Shimmer
Cableguys: Snapback (amazing drum layering time-saver), ShaperBox3
Rob Papen: RP-Distort2 (crazy good distortion)
Camel Audio: Camel Phat, CamelSpace (RIP)
Native Instruments: Guitar Rig 5
Audio Damage: Vapor, Fluid, Liquid
Monitoring: Slate VSX (this is very pricey but it's been hugely helpful with having only a terrible room to mix in, it's pretty much cut out the 5-10 car check revisions that were the norm for me)
Have I forgotten a bunch of things here? Yes, yes I have.