  This is a review of spin-dependent (polarization) properties of
multicomponent exciton-polariton condensates in conditions when
quasi-equilibrium mean-field Gross-Pitaevskii description can be applied.
Mainly two-component (spin states $\pm1$) polariton condensates are addressed,
but some properties of four-component exciton condensates, having both the
bright (spin $\pm1$) and the dark (spin $\pm2$) components, are discussed.
Change of polarization state of the condensate and phase transitions in applied
Zeeman field are described. The properties of fractional vortices are given, in
particular, I present recent results on the warping of the field around
half-vortices in the presence of longitudinal-transverse splitting of bare
polariton bands, and discuss the geometrical features of warped half-vortices
(in the framework of the lemon, monstar, and star classification).
