Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
Boatsetter - Rent a boat, with or without a captain. Powerboats and sailboats, anywhere in the country.
Event Hunt - Startups and Tech Events Curated By Locals
GetMyBoat - Book boat rentals, charters, tours, and lessons in 171 countries around the world.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Antlos - Airbnb for boats