1- CarX Street

( One Of My Favorite Game) CarX Street is an open world street racing game featuring realistic car physics, dynamic day and night cycles, and more customization options. Players can explore a vast city, participate in various racin2-g events, and build their dream cars.
There are both Mountain and city map in this game
This game is one of the most Realistic Open World Car games
2- Mad Out 2 Big City Online

An open world game that combines racing and action elements. In this game we can explore a large city, engage in races, and interact with other players online.
3- Drive Zone Online

A car driving simulator featuring an open world with various terrains. In this game we can customize cars, participate in races, and explore the environment.
4- Gangster Vegas

This is an adventure game set in a vast open world representation of Las Vegas. Players can engage in street races, vehicle heists, and explore the city using a variety of cars and motorcycles.
5- Gangster New Orleans

Similar to Gangster Vegas. Set in the vibrant city of New Orleans, this game offers an expansive open world with diverse vehicles to drive. We can participate in missions, races, and explore the city unique districts.
6- Need for Speed Heat

A racing game set in an open world environment called Palm City, a fictionalized version of Miami, Florida. Players can participate in sanctioned race events during the day and illicit street racing at night, with a focus on vehicle customization and police pursuits.
7- Asphalt 9 Legends

A popular arcade racing game featuring an extensive roster of real hypercars diverse locations, and both single player and multiplayer modes. We can perform dynamic stunts and explore detailed tracks.
8- Real Racing 3

This game is Known for its realistic graphics and physics, this game offers a variety of real world cars and tracks. Players can engage in numerous events and challenges in an open ended racing experience.
9- CarX Drift Racing 2

While primarily focused on drift racing, this game features open world environments where players can freely drive and practice their drifting skills.
10- Car Parking Multiplayer

This is an open world driving simulation game developed by Olzhass, available on Android and iOS. It offers more than just parking challenges, featuring free-roam exploration, multiplayer interactions, and extensive vehicle customization.
Guys if i miss any game from this list you can tell me so i can add it as soon as possible
Thanks
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These games availability and features may vary based on your device and region.