Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Tiny Flashlight + LED - Tiny Flashlight + LED is free to use application that can be used anywhere else, having nicely built-in functionality.
Event Hunt - Startups and Tech Events Curated By Locals
Hmu - Hmu is a social app by SC Friends that enables users to search for new friends by viewing a list of users from all around the globe and tap on the desired profile to engage in live chat with them.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Flashlight - Control your Mac with a keystroke.