Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.
Android Studio - Android development environment based on IntelliJ IDEA
Lumix Engine - Open source 3D game designer and engine written in C++.
Flutter - Build beautiful native apps in record time 🚀
MOS - Lightweight game engine.
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.