Bartender's Choice Vol. - The definitive classic cocktail app
Discotech - Opentable for nightlife. Tickets, guest lists, and VIP.
Trophy Cocktail - The premier photo sharing app -- just for cocktails
Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Cocktail Flow - The Definitive Cocktail Encyclopedia
Nightler - Find the people. Live the night.