Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
wxWidgets - wxWidgets: Cross-Platform GUI Library
Android Studio - Android development environment based on IntelliJ IDEA
Electron - Build cross platform desktop apps with web technologies
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.
GTK - GTK+ is a multi-platform toolkit for creating graphical user interfaces.