Cocos simplifies game creation and distribution with Cocos Creator
Open source library for creative expression on the web, desktop, etc.
The AWS GameKit Plugin for Unreal
Children's learning programming language Karel the Robot in 3D
Classic pac-man on Qt with pure C++.
Android port of DoomRL (Doom, the Roguelike)
The Atomic Game Engine is a multi-platform 2D and 3D engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Cross platform Game Creation Software