  The program N2HDECAY calculates the branching ratios and decay widths of the
Higgs bosons of the Next-to-Two-Higgs-Doublet Model (N2HDM). The code
incorporates the dominant higher-order effects by including QCD corrections and
off-shell decay modes. The N2HDM is an extension of the Standard Model by a
Higgs doublet and a real Higgs singlet. Its phenomenology can change
dramatically depending on which global symmetries are broken by electroweak
symmetry breaking. It can feature a large visible Higgs sector in the broken
phase, behave like a 2HDM with scalar singlet dark matter in the dark singlet
phase, or, in the inert doublet phase, extend an inert doublet model by mixing
a singlet with the SM Higgs boson. N2HDECAY provides precise predictions for
the decays of the Higgs bosons in all of these phases.
