You can use one or more of the following popular software and tools to develop mobile applications:
Android Studio: It is the official integrated development environment recommended by Google for developing Android applications. It supports Java or Kotlin programming languages.
Xcode: An integrated development environment provided by Apple for developing iOS applications. It supports Swift or Objective-C programming languages.
React Native: A JavaScript-based framework, React Native enables you to develop mobile apps for both Android and iOS with a single codebase. React Native offers rapid prototyping and faster development processes.
Flutter: Developed by Google, Flutter is an SDK for Android and iOS that lets you develop beautiful and performant mobile apps with a single codebase. It uses the Dart programming language.
Xamarin: Backed by Microsoft, Xamarin enables you to develop mobile apps for Android, iOS and Windows Phone using a .NET-based framework. It uses the C# programming language.
Appcelerator Titanium: Based on JavaScript, Appcelerator Titanium allows you to create mobile applications for Android and iOS using web technologies (HTML, CSS, JavaScript).
Ionic: A framework that enables you to develop cross-platform mobile applications using HTML, CSS, and JavaScript, Ionic is based on AngularJS and Apache Cordova.
These software and tools support different aspects of mobile application development and can be chosen depending on your preference, your project's requirements and your level of experience. By doing research, you can evaluate its features, ease of use, and community support. In addition, software documentation and online resources can assist you in learning and using the software of your choice.