GetYourGuide - Get tickets to the most popular attractions while travelling
Rocket Reads - A simpler alternative to Goodreads
Viator - Tours, things to do, sightseeing tours, day trips and more from Viator.
Knowall - Book Recommendations from Friends
Airbnb Experiences - Airbnb expands beyond rentals — now hosting Experiences
Kooba - An interactive graph for finding new books