  It is shown that the canonical classical $r$-matrix arising from the
Drinfel'd double structure underlying the two-fold centrally extended (2+1)
Galilean and Newton-Hooke Lie algebras (with either zero or non-zero
cosmological constant $\Lambda$, respectively) originates as a well-defined
non-relativistic contraction of a specific class of canonical $r$-matrices
associated with the Drinfel'd double structure of the (2+1) (anti)-de Sitter
Lie algebra. The full quantum group structure associated with such (2+1)
Galilean and Newton-Hooke Drinfel'd doubles is presented, and the corresponding
noncommutative spacetimes are shown to contain a commuting 'absolute time'
coordinate ${\hat x}_0$ together with two noncommutative space coordinates
$({\hat x}_1,{\hat x}_2)$, whose commutator is a function of the cosmological
constant $\Lambda$ and of the (central) 'quantum time' coordinate ${\hat x}_0$.
Thus, the Chern-Simons approach to Galilean (2+1) gravity can be consistently
understood as the appropriate non-relativistic limit of the Lorentzian theory,
and their associated quantum group symmetries (which do not fall into the
family of so-called kappa-deformations) can also be derived from the (anti)-de
Sitter quantum doubles through a well-defined quantum group contraction
procedure.
