Quote Originally Posted by laragiles View Post
Xamarin is a Microsoft open-source framework that is relatively new but widely popular. It is a tool for cross-platform mobile app development. Xamarin uses C# as its single language to create apps on both Android and iOS. It is a great option for building high-quality mobile apps that look native.
Microsoft did not develop Xamarin. They bought it. Subsequently they created .Net MAUI from Xamarin. Windows is also supported by Xamarin and .Net MAUI. Linux is not yet supported by .Net MAUI but it will be eventually.

If the application is only for Android then it is possible to use Java. Java is the native language for Android. There are many possible IDEs; Eclipse is very popular. For anyone familiar with C++ and C, the native language for Linux is C; C++ can also be used. Android is often called an operating system but it is more of a UI on top of Linux; Linux is the operating system for Android.

For non-programmers there are probably application generators but I know nothing about that.