Wikivoyage - the free worldwide travel guide that anyone can edit.
The Basetrip - Cities - Travel information for 650+ cities & 230+ countries
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.
Visa List - Know where you can travel with your passport tension free ✈️
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
Lonely Planet - travel guide book publisher