  Program SHELLSPEC is designed to calculate light curves, spectra, and images
of interacting binaries and extra-solar planets immersed in a moving gaseous or
dusty circumstellar matter. It solves simple radiative transfer along the line
of sight in 3D moving media. The Roche model and synthetic spectra from the
stellar atmosphere models such as TLUSTY from Ivan Hubeny can be used as a
boundary condition for the radiative transfer. The latest publicly available
version is Shellspec39. The code has been combined with other methods such as
Doppler tomography and interferometry and used to analyze spectroscopic,
photometric, and interferometric observations of binary stars and transiting
exoplanets. A few examples are briefly mentioned.
