Adeline
Natural and electrical lighting problems can be solved, in simple rooms or the most complex spaces, for PC.
http://www.ibp.fhg.de/wt/adeline/

AGI32
Lighting analysis software program that provides lighting calculations and renderings for electric lighting and daylighting system analysis, for PC.
http://www.lightinganalysts.com/

Architectural Lighting Design Software
Natural and artificial lighting software, for PC.
http://www.schorsch.com/

Let There Be Light
Software for natural and artificial lighting, indoor and outdoor, for Apple Macintosh.
http://www.ltblight.com/

LightCalc
Goes to work determining the appropriate footcandle level, fixture spacing, and it will suggest a ceiling layout for your fixtures, for PC.
http://www.lightcalc.com/

Lighting technologies
Simply Lighting 2002 - fast results to complex lighting tasks, the simply lighting suite of products include: indoor, outdoor, roadway, economics, and photometrics, for PC.
http://www.lighting-technologies.com/

Lightscape Global
Illumination rendering and radiosity for more intuitive, real-world lighting and richer, more realistic images, for PC.
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=775075

Litestar
Lighting design program for indoor, tunnel, big areas, for PC
http://www.oxytech.it/

Lithonia Lighting Software
Lighting simulation software, for PC.
http://www.lithonia.com/software/

LuxArt
To create your lighting in 2D and 3D, organize, test and communicate your ideas with plans and schedules, for PC.
http://www.luxart.com/

Radiance
Lighting simulation and rendering system, for PC.
http://radsite.lbl.gov/radiance/papers/sg94.1/software.html#Begin

Relux
Comprehensive set of electronic tools, combining product and catalog information, technical data, application tools, software and product graphics, for PC.
http://www.relux.biz/