  Driven by the needs of the intensity frontier projects with their Megawatt
beams, e.g., ESS, FAIR and Project X, and their experiments, the event
generators of the MARS15 code have been recently improved. After thorough
analysis and benchmarking against data, including the newest ones by the HARP
collaboration, both the exclusive and inclusive particle production models were
further developed in the crucial for the above projects - but difficult from a
theoretical standpoint - projectile energy region of 0.7 to 12 GeV. At these
energies, modelling of prompt particle production in nucleon-nucleon and
pion-nucleon inelastic reactions is now based on a combination of phase-space
and isobar models. Other reactions are still modeled in the framework of the
Quark-Gluon String Model. Pion, kaon and strange particle production and
propagation in nuclear media are improved. For the alternative inclusive mode,
experimental data on large-angle (> 20 degrees) pion production in
hadron-nucleus interactions are parameterized in a broad energy range using a
two-source model. It is mixed-and-matched with the native MARS model that
successfully describes low-angle pion production data. Predictions of both new
models are - in most cases - in a good agreement with experimental data
obtained at CERN, JINR, LANL, BNL and KEK.
