Links

Radiative transfer (Wikipedia)

List of radiative transfer codes (Wikipedia)

I3RC: The intercomparison of three-dimensional radiation codes.

The I3RC community Monte Carlo model

The libRadtran: A radiation library freely distributed under GPL.

Monte Carlo radiation codes

SHDOM: Spherical harmonic discrete ordinate method for atmospheric radiative transfer.

OpenCLASTR: Open clustered libraries for atmospheric science and transfer of radiation.