OS X's Wi-Fi Diagnostics tool. That's because it's hidden away. To get it, Option-Click
You can sign PDF documents with your webcam, annotate files, fill out forms, and even insert new pages into a file.
Ink is OS X's handwriting recognition app that only appears as a preference pane when you connect a graphics tablet to your computer.
Seashore is an open source image editor for Mac OS X's Cocoa framework. It features gradients, textures and anti-aliasing for both text and brush strokes. It supports multiple layers and alpha channel editing. It is based around the GIMP's technology and uses the same native file format.
However, unlike the GIMP, Seashore only aims to serve the basic image editing needs of most computer users, not to provide a replacement for professional image editing products. Seashore was created by Mark Pazolli who led the project until the end of 2009.
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