[chryton]

For physical games: Citadels, Hanabi, Love Letter (pick about any flavor), Star Realms, Sushi Go! or Sushi Go Party!, Jaipur, Werewords, One Night Ultimate Werewolf/Alien/Vampire

Digital games (mobile or computer): Ticket to Ride, Star Realms, Jaipur, Splendor (I'd recommend the physical game but it is a bit too much air in the box to buy physically for a nomad), Patchwork.

[evanb]

One Night Ultimate Werewolf gives the app away for free, and you can play with just a deck of cards.

[chryton]

Quite true. Some groups will have problems without a few of the aids, though, so it is definitely not a requirement but a nice to have.