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