Tripadvisor - The Tripadvisor mobile app is available for the Android and iOS platforms. It can be used to create reviews of hotels, restaurants, and to chat with other travelers on Tripadvisor forums.
GetYourGuide - Get tickets to the most popular attractions while travelling
NetBuddy - Netbuddy is a virtual network operator for a mobile device.
Airbnb - Book unique places to stay and things to do.
Wikivoyage - the free worldwide travel guide that anyone can edit.
Klook - Discover & book amazing experiences at exclusive prices