Gateway games generally have simple rules that are easy to teach non-gamers in order to attract new players into board gaming as a hobby. But they are great even for seasoned gamers to start off your game night or play between heavier games.
Survive: Escape From Atlantis 30th Anniversary Edition
Rhino Hero: Super Battle
Forbidden Desert: Thirst for Survival
Isle of Skye: From Chieftain to King
Century: Spice Road
Tsuro: The Game of the Path
Tokaido: 5th Anniversary Edition
Dominion: Dark Ages Expansion
Dominion: Alchemy Expansion
Dominion: Intrigue (Second Edition)
Ticket To Ride - Ding & Dent
Clank! In! Space!
The Resistance: Avalon
Telestrations Party Game