Party with a Local - Party with a Local is a free app that connects travelers with locals that want to party.
Discotech - Opentable for nightlife. Tickets, guest lists, and VIP.
Palaround - Meet people you should be friends with.
Nightler - Find the people. Live the night.
Project Fixup - Meet people, not profiles
PartyUP - See videos from the best nightlife venues in your city.