Here are some mobile app frameworks:
1. React Native: This is a popular cross-platform mobile app framework developed by Facebook. It allows developers to build rich, native-like experiences for both iOS and Android platforms using JavaScript.
2. Flutter: This is a relatively new entrant in the mobile app development space, developed by Google. Flutter uses Dart as its programming language and allows developers to build high-quality apps with beautiful UIs that work on both iOS and Android platforms.
3. Ionic: This is another popular cross-platform mobile app development framework that uses web technologies such as HTML, CSS, and JavaScript to build apps for both iOS and Android platforms.
4. Xamarin: Owned by Microsoft, this platform enables developers to create native applications for multiple operating systems using C# codebase shared across these platforms.
5. PhoneGap/Cordova: This platform provides a way to use standard web technologies like HTML5, CSS3 & JavaScript for cross-platform development of hybrid apps that can be deployed on multiple devices easily.
6. Appcelerator Titanium: With Appcelerator Titanium you can develop native apps using HTML/CSS/JavaScript while still having access to more advanced device features like location services or camera functionality without the need of learning native languages
These frameworks offer various benefits such as increased productivity levels through reusable components , ease of testing/debugging possibilities & ability to deliver highly customized user experiences with High Performance but it require professionalism and expertise to develop a successful and and this can be done only by the best mobile app development company in USA.