The Basetrip - Cities - Travel information for 650+ cities & 230+ countries
Covid-19 Controls - Lockdown measures and tourists restrictions around the world
The Basetrip API - Country travel information API
Visa List - Know where you can travel with your passport tension free ✈️
Trip Noodle - Essential travel information compiled into one handy email.
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.