Smith, 31, helped Bern win the Swiss League title in 2015-16, posting five points in 17 games.
Prior to his one-season stint in Europe, the 6-foot-1, 192-pound Ottawa native played 453 regular-season games in the AHL with Bridgeport, Springfield, Syracuse, Norfolk, Wilkes-Barre/Scranton and Toronto, registering 153 goals and 193 assists for 346 points. He is a six-time 20-goal scorer in the AHL and played in the AHL All-Star Classic in 2012. Smith also won a Calder Cup championship with Norfolk in 2012.
Over 106 NHL games with the N.Y. Islanders, Anaheim, Columbus, Tampa Bay, Pittsburgh and Toronto, Smith has posted nine goals and 11 assists for 20 points.
Zolnierczyk, 28, skated in 24 AHL games with San Diego in 2015-16, notching six goals and three assists for nine points. He also made one NHL appearance with Anaheim.
Entering his sixth season out of Brown University, Zolnierczyk has totaled 64 goals and 70 assists for 134 points in 257 career AHL games with Adirondack, Norfolk, Wilkes-Barre/Scranton, Bridgeport and San Diego.
In 60 NHL contests with Philadelphia, Pittsburgh, the N.Y. Islanders and Anaheim, Zolnierczyk has notched five goals and four assists.