Carcassonne (iOS)
Used by 5 peoplecarcassonneapp.com ↗

“Carcassonne, "which remains a benchmark of masterful iOS translations of classic board games" according to Apple, is the flagship product.”
Martin Pittenauer Interview, Co-founder (TheCodingMonkeys) · via Uses This 
“Oh, and I play a lot of Carcassonne.”
Chris Wanstrath Interview, CEO and co-founder, GitHub · via Uses This