If you are into RC modeling then Profili might be interesting for you. It allows modeling of aerofoils and then generation of the ribs to construct the wing. The pieces are exported as DXF so they can then be cut on a CNC machine. The software has a database of over 2200 aerofoils.

Profili Screenshot

Another piece of software that looks useful is CamBam. It can take a DXF file and generate toolpaths, exporting to g-code. Also features a scripting interface and support for .NET DLLs, which is particularly interesting to me.

CamBam Screenshot