Steam Deck
Used by 4 peopleen.wikipedia.org ↗

“I mostly test on a cracked old iPad, an old iPhone (from the same friend!), and a Steam Deck that my publisher got me so I could work on controller support.”
Michael Brough Interview, Game developer, potion brewer · via Uses This 
“A Steam Deck docked on the official dock (current obsession: Tiny Rogues)”
Justin Duke Interview, Founder/CEO (Buttondown) · via Uses This