  The separation of the gamma-ray bursts (GRBs) into short/hard and long/soft
subclasses, respectively, is well supported both theoretically and
observationally. The long ones are coupled to supernovae type Ib/Ic - the short
ones are connected to the merging of two neutron stars, where one or even both
neutron stars can be substituted by black holes. These short GRBs - as merging
binaries - can also serve as the sources of gravitation waves, and are
observable as the recently detected macronovae. Since 1998 there are several
statistical studies suggesting the existence of more than two subgroups. There
can be a subgroup having an intermediate durations; there can be a subgroup
with ultra-long durations; the long/soft subgroup itself can be divided into
two subclasses with respect to the luminosity of GRBs. The authors with other
collaborators provided several statistical studies in this topic. This field of
the GRB-diversity is briefly surveyed in this contribution.
