  ULYSSES is a python package that calculates the baryon asymmetry produced
from leptogenesis in the context of a type-I seesaw mechanism. The code solves
the semi-classical Boltzmann equations for points in the model parameter space
as specified by the user. We provide a selection of predefined Boltzmann
equations as well as a plugin mechanism for externally provided models of
leptogenesis. Furthermore, the ULYSSES code provides tools for
multi-dimensional parameter space exploration. The emphasis of the code is on
user flexibility and rapid evaluation. It is publicly available at
https://github.com/earlyuniverse/ulysses
