  KNOSOS (KiNetic Orbit-averaging SOlver for Stellarators) is a freely
available, open-source code
(\href{https://github.com/joseluisvelasco/KNOSOS}{https://github.com/joseluisvelasco/KNOSOS})
that calculates neoclassical transport in low-collisionality plasmas of
three-dimensional magnetic confinement devices by solving the radially local
drift-kinetic and quasineutrality equations. The main feature of KNOSOS is that
it relies on orbit-averaging to solve the drift-kinetic equation very fast.
KNOSOS treats rigorously the effect of the component of the magnetic drift that
is tangent to magnetic surfaces, and of the component of the electrostatic
potential that varies on the flux surface, {\varphi}_1. Furthermore, the
equation solved is linear in {\varphi}_1, which permits an efficient solution
of the quasineutrality equation. As long as the radially local approach is
valid, KNOSOS can be applied to the calculation of neoclassical transport in
stellarators (helias, heliotrons, heliacs, etc.) and tokamaks with broken
axisymmetry. In this paper, we show several calculations for the stellarators
W7-X, LHD, NCSX and TJ-II that provide benchmark with standard local codes and
demonstrate the advantages of this approach.
