Wire for iOS (iPhone and iPad)
The official Wikipedia iOS app
DuckDuckGo Browser for iPhone and Mac
Lightweight, embedded, syncable NoSQL database engine for iOS and Mac
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Zero Hour running natively on macOS, iPhone & iPad
Cross-Platform C++ 2D/3D game engine
Solar2D Game Engine main repository (ex Corona SDK)
Satisfying monster shooter
Improved Quake III Arena engine
Open source routing engine for OpenStreetMap
Tool to build cross-platform and high-performance awesome apps
An iOS & tvOS Frontend for Multiple Emulators
Embeddable JSON Database engine C library
A JavaScript NES emulator
A modern cross-platform low-level graphics library
JUCE is an open-source cross-platform C++ application framework
Real-time physically based rendering engine for Android, iOS, and more
UCI chess engine
Open-source engine for Heroes of Might and Magic III
A powerhouse of audio functionality for macOS, iOS, and tvOS
A real-time physically based 3D rendering engine for React Native
Java/JavaFX/Kotlin Game Library (Engine)
A completely free, open-source, 2D game engine
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs