Flutter is an open-source framework by Google for building beautiful, natively compiled, multi-platform applications from a single codebase.
React Native
React Native lets you create truly native apps and doesn't compromise your users' experiences.
Ionic
Ionic is an open-source framework built with Apache Cordova (PhoneGap) and Angular, allowing developers to build Android and iOS apps for seamless mobile performance.
Xamarin
Xamarin is a Microsoft-owned open-source framework for developing native and high-performance Android, iOS, macOS, tvOS, and watchOS apps leveraging .NET and C# programming languages.
Native Script
This open-source framework is preferred to reduce the time and code of the app loads.