The CERN Open Data portal classifies each simulated dataset into one category or subcategory. The scheme used here follows closely the CMS Physics Publications and ATLAS Physics Analysis Groups & Summary Plots structures.
Please find below the description of each category.
Datasets for bottom- and charm-quark production:
Datasets related to Higgs physics including Standard Model and (N)MSSM
Datasets for jet, vector-boson production and production of vector-bosons with associated jets:
Datasets for p–Pb, Pb–Pb collisions, and p–p reference set
Datasets for new heavy particles, including heavy resonances like Z′ and W′, di-boson resonances, heavy partners of the top quark (with vector-like quark (VLQ) properties)
Datasets for non-supersymmetric physics beyond the Standard Model: extra dimensions, mini black holes, dark matter, extended Higgs models, compositeness
Datasets for production of supersymmetric (SUSY) particles including scenarios for both R-parity conservation and violation. ((N)MSSM Higgs production is under Higgs Physics)
Datasets for Monte Carlo generator studies and tuning, and for studies of systematic variations in different physics processes
A word of advice: the categorisation is done automatically, so some datasets may be miscategorised.