Radiance:
     http://www.radiance-online.org/

Daysim:
     http://daysim.ning.com/

Diva4Rhino:
     http://diva4rhino.com/

umi (Urban Daylight Modeling):
     http://urbanmodellinginterface.ning.com/

Archsim:
    http://archsim.com/

Ladybug + Honeybee:
     http://www.food4rhino.com/project/ladybug-honeybee?etx
     http://www.grasshopper3d.com/group/ladybug

JALOXA:
     http://www.jaloxa.eu/resources/radiance/colour_picker.shtml
     http://www.jaloxa.eu/webhdr/index.shtml

Anyware Software (to download Photosphere):
     http://www.anyhere.com/

hdrscope:
     http://courses.washington.edu/hdrscope/


Lighting Materials for Simulation:
     http://lighting-materials.com/