Just looking at the Archer application usage over the last month, lots of materials modelling codes, electronic structure calculations and quantum-mechanical molecular dynamics, from first principles.
ARCHER is the latest UK National Supercomputing Service. The ARCHER Service started in November 2013 and is presently expected to run till November 2019. ARCHER provides a capability resource to allow researchers to run simulations and calculations that require large numbers of processing cores working in a tightly-coupled, parallel fashion.
Also clear that Fortran still dominates
As I've said many times I'm not a big Fortran user but the Fortran on a Mac page is the most accessed page on the site.