Microsoft Visual Studio - Microsoft Visual Studio is an integrated development environment (IDE) from Microsoft.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Visual Studio Code - Build and debug modern web and cloud applications, by Microsoft
Xamarin.Android - Integrated environment for building not only native Android but iOS and Windows apps too.
Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.