Maps.Me

Maps.me is the best free offline world maps giving the users the power to navigate irrespective of their location and access to the internet.

Started in 2010, and the app release in 2011, Maps.me is used by 90M users worldwide.
The app has "Discover Nearby" feature to locate Banks, ATMs, restaurants, cultural heritages, and even allows to book hotels and hire local guides.

Maps.me is open-source app and available on App Store, and Play Store.