  In anticipation of upcoming gravitational wave experiments, we provide a
comprehensive overview of the spectra predicted by phase transitions triggered
by states from a large variety of dark sector models. Such spectra are
functions of the quantum numbers and (self-) couplings of the scalar that
triggers the dark phase transition. We classify dark sectors that give rise to
a first order phase transition and perform a numerical scan over the thermal
parameter space. We then characterize scenarios in which a measurement of a new
source of gravitational waves could allow us to discriminate between models
with differing particle content.
