Guess I'll join in here
Bissell Little Green machine. Works great for carpets, seats, and also around the house!
Shop Vac, top motor unit is removable and turns into a leaf blower, use it all the time for drying cars off.
Keep my towels / pads in this, bottom for clean, top for dirty.
Porter Cable 7424XP - great tool, just WAY down on power, bought a brush for it for interior cleaning, works great for that.
UDM 1000 - the original Ultimate Detailing Machine, not the rebadged second gen PC version. TONS of power, has as much power on speed 3 as the PC does on 6. As you can see though it is getting old and beat up....
Wagner heat gun - I use this for various jobs, rubber removal, badge removal, heat and reapply trim etc.
Various brushes, I have more but they are out in my truck, didn't feel like grabbing them

Q-Tips
I use Eagle 1 Tire Swipes, they work great.
Yellow bug sponges.
Menzerna Powergloss Compound
Menzerna 106Fa / SF4000
Menzerna Super Intensive Polish
Samples of HD Cut and HD Polish. These are amazing polishes, will be ordering some soon as well as Menzerna FG400
Detailiers Pride Rinsless Wash & Gloss - LOVE this stuff! Rinseless washing is awesome
Meguiar's Wheel Brightener - This stuff is STRONG! It will eat normal sprayers and cleans the nastiest of wheels. If I don't need this stuff then soap and water works just fine.
Spraymaster bottle with 2:1 dilution of the Megs WB
Purple Power degreaser - Good stuff that can be found easily locally.
Spraymaster with 3:1 dilution of PP degreaser
Lexol cleaner and conditioner - Works ok, but seeking something better, not terribly impressed.
Meguiar's Gold Class car wash - This or Dawn, basically all I use.
Stoners Invisible Glass - Works exactly as it says.
Stoners Tarminator - Perfect for bug / tar removal.
Folex - This is a great spot cleaner for nasty stains in seats / carpet.
IPA - 1000 uses for this stuff.
303 Aerospace protectant - Perfect look, not too shiny, not dull, no greasy feeling, doesn't attract dust.
Meguiar's quick detailer - Works good whenever needed
Meguiar's #21 2.0 - My go to LSP for most of my details, goes on easy and off easy as well, lasts 4 to 6 months
Meguiar's Hot Shine tire foam - Mainly use this or any other cheap spray for dressing fenderwells.
Meguiar's Gold Class Endurance tire shine gel - By far my favorite dressing, also have it in aerosol for tires with difficult sidewalls, love this stuff!
Turtle Wax chrome polish - Great for any chrome or stainless.
Masking tape and painters tape, use it all the time for taping things off I don't want to get polish or wax on, definitely a must have in the detailing arsenal.
Pinnacle Souveran paste wax - Honestly an ok wax, but much more hype then anything. I would pay $30 for it but certainly not the regular $100 price. I got it on sale for $50 a couple years ago. Supposed to be a "beauty wax" that looks amazing but offers only a few weeks of protection.... With proper surface prep nobody would know the difference between this and basically any other wax.
Wolfgang Fuzion - Basically the same opinion as with the Souveran. I got it on sale for 1/2 off a few years ago but would never pay the full price for it, and really wouldn't even pay 1/2 price for it again. I like it, but mainly for the same reason as the Souveran - ease of use.
Samples of Zymol Royale and Zymol Vintage. I received these from a member on autogeek after a discussion about the crazy expensive waxes ( roughly $2,000 for Vintage and $7,000 for Royale, lifetime refills on both though) really being that much better then the rest of them... I tried them, they are nothing that special to me, nothing more then the Souveran or Fuzion and you already know my opinion of them. Now, don't get be wrong, all of these are nice waxes, they look, smell, and work great, the prices are just absurd.
Mineral Spirits and Spar urethane for headlight restorations.
Meguiar's Clay bar - Works good, basically any clay you buy is the same as they are all under the same patent no matter the brand except Clay Magic and I believe Mothers... which isn't that good.
3M trim adhesive - I use this with the heat gun to reapply peeled off trim etc...
Tooth brush and detailing brush - These get used all the time on interiors and vents.
I also have tons of towels for general purpose, polish removal, wax removal, drying, interior and underhood. I use Lake Country CCS 5.5" pads for polishing. My UDM is going downhill pretty quick and I am seriously looking at the Rupes LHR21ES Bigfoot polisher, that is an amazing tool!
My arsenal is pretty small this year as I just haven't really done any detailing. I have been working 60+ hours a week for the most part since the beginning of summer so that makes it difficult to want to detail for 6 hours before work or on a weekend day that I might have off.