  A recently developed continuous time solver based on an expansion in
hybridization about an exactly solved local limit is reformulated in a manner
appropriate for general classes of quantum impurity models including spin
exchange and pair hopping terms. The utility of the approach is demonstrated
via applications to the dynamical mean field theory of the Kondo lattice and
two-orbital models. The algorithm can handle low temperatures and strong
couplings without encountering a sign problem.
