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
PhotoLine is a raster and vector graphics editor for Windows and Mac OS X. Its features include 16 bits of color depth, full-color management, support of RGB, CMYK and Lab color models, layer support, and non-destructive image manipulation. It can also be used for desktop publishing.
License: Commercial
Photoline is a powerful graphic design tool with extensive vector support and advanced editing features, making it ideal for professionals. In contrast, Seashore offers a simpler interface and is suited for casual users looking for basic image editing capabilities.