99rent is a free Android app developed by CorCode to assist car rental companies in managing their rentals through the SO Rent system. The app allows for remote pick-up and drop-off of vehicles by customers.

The user interface is simple and easy to navigate, with options to view reservations, vehicles, and customers. The app also includes a feature to scan customer IDs and documents for verification purposes. The app's ability to remotely manage rentals is a convenient feature for both car rental companies and customers.

Overall, 99rent is a useful tool for car rental companies looking to streamline their rental process and provide a convenient experience for their customers.