SMARTS (The Simple Model of the Atmospheric Radiative Transfer of Sunshine)
Encyclopedia
SMARTS is a software published as a freeware
Freeware
Freeware is computer software that is available for use at no cost or for an optional fee, but usually with one or more restricted usage rights. Freeware is in contrast to commercial software, which is typically sold for profit, but might be distributed for a business or commercial purpose in the...

 by the National Renewable Energy Laboratory.
It is used to compute solar radiation on earth at one location/time and taking into account atmospheric conditions.

It can be used for example to evaluate solar panel production.
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