A free program for Android, by NASA.

ISS Explorer is an interactive tool for exploring the parts and pieces of the International Space Station (ISS). It is a 3D modeling application which allows you to view the ISS from any angle, zoom into it, and select parts and pieces.

The user interface is very simple and easy to use, allowing you to quickly navigate through the application. There is also a settings tab available on the left hand side of the screen which allows you to customize the application to your preference.

The application is a simulation of the ISS which allows you to see different parts of the station and have them labeled for your convenience. It also allows you to rotate the model to view from different angles.