Downloading OpenGL. In all three major desktop platforms ( Linux, macOS, and Windows), OpenGL more or less comes with the system.
When you first open Adobe Photoshop CS6, the most eye- catching thing is the revamped colorful user interface.
Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.