  The perovskite-like transition-metal oxide Gd$_{1-x}$Sr$_x$TiO$_3$ is
investigated by measurements of resistivity, specific-heat, and electron
paramagnetic resonance (EPR). Approaching the metal-to-insulator transition
from the metallic regime ($x \geq 0.2$), the Sommerfeld coefficient $\gamma$ of
the specific heat becomes strongly enhanced and the resistivity increases
quadratically at low temperatures, which both are fingerprints of strong
electronic correlations. The temperature dependence of the dynamic
susceptibility, as determined from the Gd$^{3+}$-EPR linewidth, signals the
importance of strong spin fluctuations, as observed in heavy-fermion compounds.
