LHC@home
LHC@home
https://lhcathome.cern.ch/lhcathome/
This a volunteer computing project that uses Internet-connected computers to advance Particle and Accelerator Physics. Participate by downloading and running a free program on your computer. By default, you can run the classic LHC@home application Sixtrack, for simulations of accelerator physics, and help researchers at CERN to improve the LHC.
Other LHC@home simulations that utilizes virtualization to run applications for Theory and experiment simulations for ATLAS, CMS and LHCb are also available.
Please note that some of the applications on LHC@home requre Virtual Box to be installed.
Here's the screensaver that was available way back when.