We have just fallen in love with Google SketchUp all over again, we are slightly late to the table on this one but Google Building Maker is now fully integrated into SketchUp 8. It has the genius ofCanoma with the addition of all the editing functions that come with SketchUp and its free:

Combine this with the free version of Unity and you have a very powerful toolset. Talking of which, we have just downloaded Unity 3.0 to further develop our agent based modelling exhibition space, its good to be back….