OmniGraffle

OmniGraffle is a tool for professional users who need to visually represent and communicate complex ideas. It enables the creation of diagrams, rapid prototyping, and design. The main features include diagram creation, rapid prototyping, and design tools for professional vector graphics. OmniGraffle is available on all devices and offers intelligent grouping, snapping, and alignment tools. The pricing model of OmniGraffle is not mentioned in the text.