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. Developed by Mark Pazolli
License: Open Source
Black Ink offers a more user-friendly experience with powerful drawing tools but requires a purchase for advanced features. Seashore, being open-source, is lightweight and suitable for basic photo editing, but lacks some of the advanced capabilities and support for raster graphics that Black Ink provides.