  The discovery of the Higgs boson (and still nothing else) have triggered
appearance of many proposals of Higgs factories for precision measurement of
the Higgs properties. Among them there are several projects of photon colliders
(PC) without e+e- in addition to PLC based on e+e- linear colliders ILC and
CLIC. In this paper, following a brief discussion of Higgs factories physics
program I give an overview of photon colliders based on linear colliders ILC
and CLIC, and of the recently proposed photon-collider Higgs factories with no
e+e- collision option based on recirculation linacs in ring tunnels.
