Numerical radiative transfer with state-of-the-art iterative methods made easy

This article presents an on-line tool and its accompanying software resources for the numerical
solution of basic radiation transfer out of local thermodynamic equilibrium (LTE). State-of-the-art
stationary iterative methods such as Accelerated Λ-iteration and Gauss–Seidel schemes, using a short
characteristics-based formal solver are used. We also comment on typical numerical experiments
associated to the basic non-LTE radiation problem. These resources are intended for the largest use
and benefit, in support to more classical radiation transfer lectures usually given at the Master
level.