PyMOL
PyMOL is a molecular visualization system. This is the open-source version of the commercial application.
There are three sizes to choose from:
Small- 1 CPU, 4GB MemoryMedium- 2 CPU, 8GB MemoryLarge- 4 CPU, 16GB Memory
Parallel rendering is enabled for the Medium and Large sizes. Select the
appropriate size based on the the size and quantity of the files you're viewing.