Two PC's with Windows 7x64 Ultimate for daily use (1090t and FX 8350) and five vintage (386, 486, P55c, k6-3 and a laptop with Pentium MMx). I made a presentation of my 386dx40 last summer and I will do for the rest of my vintage machines soon...

I'm using DOS 6.22, PC-DOS 2000, DOS 7.10, Windows 3,11 FWG, Windows 95B and Windows 98SE.

Let's see, I have (listed in order of roughly how much I use them):

Mac Pro 5,1 (2010), 2x Xeon 3.33GHz X5680, 16GB RAM, 512GB SSD, 2TB HDD, Radeon 7970 3GB
This is my day-to-day "modern" desktop computer

15" Macbook Pro (Mid-2014), i7 4770HQ 2.2GHz, 16GB RAM, 256GB SSD, Iris Pro 5200
This is my day-to-day laptop, though I rarely actually "need" a laptop these days

i7 2600K 3.4GHz, 24GB RAM, 256GB SSD, 2TB HDD, 6TB HDD, Radeon 5770, Gentoo Linux
This is my fileserver/HTPC

486DX2-66, 16MB RAM, 540MB HDD, S3 Trio32 VLB, SB16, GUS, DOS 6.22/Win3.1, AT case
This is my primary retro PC

Toshiba 430CDT, 48MB RAM, 2GB HDD, CT65550 2MB, ESS688 and YMF262, Win95
This is my primary retro laptop mainly used when "I want to write DOS code whilst sitting back in a recliner/beanbag/etc"

Pentium 233MHz MMX @ 2.5x 100MHz FSB (SS7 Motherboard), 64MB RAM, 8GB HDD, Matrox Mystique 220 4MB, Diamond 3dfx Voodoo2 12MB, Philips YMF719E-S, Win95, AT case

AMD Duron 800MHz, 256MB RAM, 40GB HDD, Diamond Stealth III S540 (S3 Savage4 Pro) 32MB AGP, Sound Blaster Live 5.1 SB0060, Win98

Thinkpad R52, Pentium M @ 1.86GHz, 1GB RAM, 80GB HDD, Mobility Radeon X300 128MB, WinXP
This was my old college laptop (which I got in my 3rd (?) year of college)

Thinkpad T500, Core2Duo P8600 @ 2.4GHz, 4GB RAM, 300GB HDD, Mobility Radeon HD 3650 256MB / Intel GMA 4500MHD, Win7 / Arch Linux
Bought brand new in 2009, and then barely used it. It still mostly has a "brand-new-in-box" smell to it.

Amiga A500, PAL, extra 512KB trap-door expansion RAM, ACA500plus (mainly for CF card support), extra external floppy drive, custom-built new PSU by Ray Carlsen
I intend to use this more often once I get an Indivision ECS which I pre-ordered just yesterday! Right now it's a pain to lug out my 14" PVM each time I want to use it.

In 100% operating condition:
Blackbird - My nearly finished i7-3770 with GTX 1060 and 16GB RAM - in a stealth black case, Win10

Old faithful - My previous build, Phenom 2 X4 965 with GTX 750Ti and 8GB - in the end giving up fewer parts than originally planned - Win10/Win7 dual boot, originally Win10 preview

Netbook N450 Atom - Win10

In other condition:
Frankenputer - My Core 2 Duo test system, was intended to be my "B" system before the demotion of "Old faithful" - state = WIP

The Medion MD8386, the previous system to "Old faithful", P4 Prescott on LGA775 that can't take any better, 2GB DDR400, put on Win10 for a lark and ran it astonishingly well (with replaced graphics) - may make this into a dedicated XP box. GPU = WIP, currently HD5670

Dell Dimension 8200 donated by friend on upgrading, 2.0GHz P4, 768MB RDRAM - not cleaned yet, AGP GF2 MX

Athlon XP1800+ donated by friend, 512MB PC133, GF2 MX - state = test install of XP on replaced HDD

Athlon Thunderbird 1000B My old Win98 system, 384MB on 3x 128 (won't take 256), Irongate chipset and 3x ISA slots, GF4MX - state = bad case of Windows rot, needs a refresh

P200MMX My old Win3.1, state = left for ages, think it has CL5446 PCI, maybe SB PCI 128

P75 slimline donated, Has S3 trio video onboard if I recall, and 32MB RAM

486DX4 100 donated, VLB system, scrambled parts (and yes, I'd better do something about the barrel battery) - CL5428 or S3 cards to play with

Spare parts
Radeon 9800Pro & Geforce 4 Ti 4200 in AGP (plus a GF2MX and a 3.3V only Rage128)
Another PCI or 2, S3 Savage 4
In PCI-E, GT730, and a X740XL (X700Pro-ish) that have a no display during Win10 install (belonged to the Medion)

A SB Live or 2, and a couple of ISA SB including my first ever, SB16 ASP MCD with added off-brand midi DB

Hmm, what to build from that junk, sorry, fine collection of archived parts