The Wadi were a humanoid species from the Gamma Quadrant initially discovered by the Vulcans. They became the first official species from the Gamma Quadrant that the Federation made first contact with. They had an unusual preoccupation with games and gambling, including the game Chula. (DS9: "Move Along Home")
Taking place in 2409, the computer game Star Trek Online features Wadi duty officers being available for the Federation and Klingon Defense Force factions.