  Three-dimensional topological gapless matters with gapless degeneracies
protected by a topological invariant defined over a closed manifold in momentum
space have attracted considerable interest in various fields ranging from
condensed matter materials to ultracold atomic gases. As a highly controllable
and disorder free system, ultracold atomic gases provide a versatile platform
to simulate topological gapless matters. Here, the current progress in studies
of topological gapless phenomena in three-dimensional cold atom systems is
summarized in the review. It is mainly focused on Weyl points, structured
(type-II) Weyl points, Dirac points, nodal rings and Weyl exceptional rings in
cold atoms. Since interactions in cold atoms can be controlled via Feshbach
resonances, the progress in both superfluids for attractive interactions and
non-interacting cold atom gases is reviewed.
