Irregular "free-form" shapes can be modeled using the mesh tool.
Roof COST Estimator contains industry standard user-modifiable unit cost data.
Rapid Prototyping Systems Ltd
RoofWright Ice is grate if you want to design your own conservatory.
Rafter+ -application for Revit® Architecture and Revit® Structure.
View the roof model and navigate the roof design in 3D.
IBC Solar AG
Easy design and quick calculation of the IBC SOLAR mounting systems.
SANKOM Sp. z o.o.
You can calculate heat-transfer coefficients (for walls, floors , roofs).
You can generate timber structure for walls and roofs in Autodesk Revit.
Ernst Schweizer AG
Designs roofs and calculate their rezistance to wind, snow and others.
Hyne & Son Pty. Ltd.
Create timber structure designs for floors, roofs, walls, and other elements.
Parkour simulation game, where you climb on the roofs of skyscrapers.