OmniGraffle

OmniGraffle is a diagramming and digital illustration application for Mac, iPhone, iPad and iPod touch created by The Omni Group. It allows users to convey ideas, organize thoughts visually, and communicate these thoughts and ideas to the world. OmniGraffle is an industry standard tool for User Experience design.

Uses

OmniGraffle is used to create high quality graphics and visuals. It's an iOS desktop and tablet application that features several design tools, along with a drag-and-drop WYSIWYG interface and a notes function that can allow users to annotate and create specification documentation for prototypes and mockups.

While OmniGraffle can produce a wide array of graphics and visuals, it's often used as a tool to create content maps, screen flows, and wire frames. Visuals are often referred to as “graffles."

Although OmniGraffle is an industry tool, it lacks interactivity capabilities and is not easily used for team collaboration due to its limitations as a desktop and tablet application.