Interactive online tools:
>> Stereographic sunpath diagrams generator
>> SOLANGLES: generates plan and section graphs of sun rays incident on a building envelope surface
>> OVERH: computes the multishading mask for a vertical window with an overhang
>> IBIC: Image based irradiation & irradiance calculations
>> UBC: an online tool to evaluate solar and daylight access in urban canyons
>> Qhli

Open source software:

R. Compagnon @ HEIA-FR