artssat provides a high-level, object-oriented interface for the Atmospheric Radiative Transfer Simulator. The aim of artssat is to provide a simpler and more modular way of performing radiative transfer simulations and in particular retrievals.
As of now, artssat is only used for my own research on remote sensing retrievals but I hope to be able to expand its capabilities over time.
Source code documentation is hosted on the projects Github pages site.