  The multi-agent system has been a hot topic in the past few decades owing to
its lower cost, higher robustness, and higher flexibility. As a particular
multi-agent system, the multiple rigid body system received a growing interest
for its wide applications in transportation, aerospace, and ocean exploration.
Due to the non-Euclidean configuration space of attitudes and the inherent
nonlinearity of the dynamics of rigid body systems, synchronization of multiple
rigid body systems is quite challenging. This paper aims to present an overview
of the recent progress in synchronization of multiple rigid body systems from
the view of two fundamental problems. The first problem focuses on attitude
synchronization, while the second one focuses on cooperative motion control in
that rotation and translation dynamics are coupled. Finally, a summary and
future directions are given in the conclusion.
