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, 4 GB MemoryMedium- 2 CPU, 8 GB MemoryLarge- 4 CPU, 16 GB 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.