Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and macOS. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
GromacsWrapper is a python package that wraps system calls to Gromacs tools into thin classes. This allows for fairly seamless integration of the gromacs tools (v4.6.x, v5.x, 2016.x, 2018.x, 2019.x, all with the same Python code) into python scripts.