Solaris Sky Calendar - An astronomy calendar right in your pocket
Unity - The multiplatform game creation tools for everyone.
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch
Godot Engine - Feature-packed 2D and 3D open source game engine.
Alpenglow - Never miss a incredible looking sunrise or sunset again
Blender - Blender is the open source, cross platform suite of tools for 3D creation.