  We present a new code to evaluate thermoelectric and electronic transport
properties of extended systems with a maximally-localized Wannier function
basis set. The semiclassical Boltzmann transport equations for the homogeneous
infinite system are solved in the constant relaxation-time approximation and
band energies and band derivatives are obtained via Wannier interpolations.
Thanks to the exponential localization of the Wannier functions obtained, very
high accuracy in the Brillouin zone integrals can be achieved with very
moderate computational costs. Moreover, the analytical expression for the band
derivatives in the Wannier basis resolves any issues that may occur when
evaluating derivatives near band crossings. The code is tested on binary and
ternary skutterudites CoSb_3 and CoGe_{3/2}S_{3/2}.
