I have operated
I will list here a history of stuff I have used.
Hardware
IBM PS/2, 4 PC compatible boxes (with 486, Pentium 133, K7, Pentium IV CPUs), a DELL Latitude C400 and a DELL Vostro 1320 subnotebook laptops, an HP G62 laptop, academic ASUS servers running Opteron CPUs, SONY and Samsung Android cellphones, several corporate laptops and PC compatible boxes, an iPhone 4s cellphone, a (2015 series) 13 inches Apple Mac Book Pro (with retina display) laptop, and an iPad 4.
Software
Microsoft (DOS 5 and 6, 3.1, 3.11, 95, 98, XP, Vista and 7), KNOPPIX (5 and 6), Ubuntu (8, 10 and 12), Debian (Squeeze, Wheezy, Jessie, Stretch, and Buster), AIX, OS X (Yosemite and El Capitan) and macOS (Sierra, High Sierra, Mojave, Catalina, and Big Sur).
KDE, vim, GNU screen, tmux, ranger, dwm, JetBrains IDEs, KDevelop 4, Xcode 9, Xcode 10...
C, C++, Python, JavaScript, PHP, Java, UNIX shell, FFL, Tcl...