  The purpose of this short review is to describe cosmological models with a
linear inhomogeneous time-dependent equation of state (EoS) for the dark
energy, when the dark fluid is coupled with dark matter. This may lead to a
bounce cosmology. We consider equivalent descriptions in terms of the EoS
parameters for an exponential, a power-law, or a double-exponential law for the
scale factor $a$. Stability issues are discussed by considering small
perturbations around the critical points for the bounce, in the early as well
as in the late, universe. The latter part of the paper is concerned with dark
energy coupled with dark matter in viscous fluid cosmology. We allow the bulk
viscosity $\zeta=\zeta(H,t)$ to be a function of the Hubble parameter and the
time, and consider the Little Rip, the Pseudo Rip, and the bounce universe.
Analytic expressions for characteristic properties of these cosmological models
are obtained.
