Wikivoyage - the free worldwide travel guide that anyone can edit.
EntryAdvise.com - With EntryAdvise, you can check COVID restrictions, the entry requirements and useful travel info for all countries. It makes a good resource for frequent-travelers and backpackers.
Triptipedia - Triptipedia is a free collaborative encyclopedia of travel tips, where everyone can browse, save and share tips for better travel!
Guides by Lonely Planet - Explore city guides curated by experts.
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.
Lonely Planet - travel guide book publisher