  Linac-ring type colliders will open new windows for both energy frontier and
particle factories. Concerning the first direction, these machines seem to be a
sole way to TeV scale in lepton-hadron collisison at constituent level. An
essential advantage of the linac-ring type lepton-hadron colliders is the
possibility of the construction of gamma-p, gamma-A and FELgamma-A colliders
based on them. Today, eRHIC, THERA (TESLA on HERA)and Linac*LHC can be
considered as realistic candidates for future lepton-hadron and photon hadron
colliders. When it comes to factories, one can reach essentially higher
luminosities comparing to standard ring-ring type machines. For example,
L=10^34 cm^-2 s^-1 can be achieved for phi and charm-tau factories. In this
presentation we briefly discuss the parameters and physics search potential of
the linac-ring type machines.
