Boatsetter - Rent a boat, with or without a captain. Powerboats and sailboats, anywhere in the country.
Idle - Rent Any Thing - A Peer-to-Peer Renting Community for Idle Goods
GetMyBoat - Book boat rentals, charters, tours, and lessons in 171 countries around the world.
Fat Lama - Borrow stuff you need. Lend stuff you don't
Antlos - Airbnb for boats
Ruckify - peer-to-peer marketplace for rentals