  A preliminary version (v0.2.1) of the DANTON Monte-Carlo package is
presented. DANTON allows the exclusive sampling of (decaying) $\tau$ generated
by $\nu_\tau$ interactions with the Earth. The particles interactions with
matter are simulated in detail, including transverse scattering. Detailed
topography data of the Earth can be used as well. Yet, high Monte-Carlo
efficiency is achieved by using a Backward Monte-Carlo technique. Some
validation results are provided.
