OmniGraffle is the easiest and most elegant way to create website wireframes, process flows, organization hierarchies, and, frankly, almost anything.
Rely on OmniGraffle to create beautifully simple documents to share with anyone. Even through an TV.
Created for both Mac and iPad, OmniGraffle’s smart shapes, stencils and contextual styling elements gracefully guide you from rough outline to pixel perfection.
For ages 5 to 105, and available here.