ArchSpline (free Plugin)
Different Arch-Splines put into an Extrude-NURBS
ArchSpline is a new Spline-Primitive for MAXON Cinema4D, capable of producing different archs, like Round-Arch, Pointed-Arch, Segmental-Arch, Horse-Shoe-Arch and Basket-Arch (3-Centered). Various settings can be adjusted like width and height of the base, and curvature of the arch.