Xamarin - Create iOS, Android and Mac apps in C#
Android Studio - Android development environment based on IntelliJ IDEA
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.
Flutter - Build beautiful native apps in record time 🚀
FEELingK - FLK wireless internet messaging solutions.
Qt Creator - Qt Creator is a cross-platform C++, JavaScript and QML integrated development environment. It is the fastest, easiest and most fun experience a C++ developer could wish for.