By order of release date:
1) Sega Genesis, with a Mega Everdrive X5
2) Sega GameGear
3) Sega Saturn, with a Phantom Universal modchip installed
4) PS1
5) N64
6) Gameboy Color, with an Everdrive GB X3
7) GBA (original and SP)
8) PS2
9) Gamecube
10) A few XBOX's, one a HALO edition in box sealed, 1 original loose, and one HALO Edition loose. All in storage ATM, and the original is softmodded.
11) 1x DS Lite, 1x DSi, got an R4i 3DS card for it
12) 2 PS3's, one 3xxx Slim, one BC phatty. BC phatty is hacked with latest 4.83 mod
13) Xbox 360 (also in storage)
14) PS Vita (OLED), on 3.65 Enso
15) New 3DS, with B9S
16) Wii Useless, no full CFW but I have Loadiine and such.
17) PS4, not hacked yet, but will be soon.
18) Xbox One
19) 2x Switch, one with a broken backlight and 1 that works just fine. Haven't done any homebrew and such on either, but my plan is to install a new screen in the broken Switch and use that for CFW and such (since it's on 3.0 IIRC), and the other for just legit stuff.