OmniGraffle is a diagramming application made by The Omni Group. OmniGraffle is built only for Mac OS X and the iPad. It may be used to create diagrams, flow charts, org charts, and illustrations. It features a drag-and-drop WYSIWYG interface. "Stencils"—groups of shapes to drag and drop—are available as extensions for OmniGraffle, and users can create their own stencils.
In many of these respects, OmniGraffle is similar to Microsoft Visio. The Professional version of OmniGraffle can both import and export Visio files created using Visio's XML export function. OmniGraffle 5 can also open Visio's native binary .vsd files. Omnigraffle doesn't provide CAD integration, as Visio does, since it lacks some features such as DWG or DXF (AutoDesk file formats), import/export functions, among others. Also it is important to notice that layers cannot be shared among some versions of Visio and OmniGraffle.
OmniGraffle uses Mac OS X's graphics layer, known as Quartz, and benefits from on-the-fly antialiasing, smooth scaling, transparent drop shadowing, and other features. OmniGraffle 4 added Bézier shapes and text-based hierarchical chart construction to the range of available tools. OmniGraffle...