Yelp Reservations - Reservations taken online, front-of-house management, and integration with Yelp.
ChatWhale - Gamify your customer communication and loyalty rewards
simpleERB - An Electronic Reservation Book for restaurants.
Dealyze - Custom Loyalty Programs for any Store (YC)
Reserve - A better dining experience. Pay effortlessly.
Gvouchers - Free service to sell gift vouchers to loyal customers