Seashore is an open source image editor for Cocoa. 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.

Seashore's features include:

• Full support for the GIMP's native XCF file format
• Read and write support for the TIFF, PNG, JPEG and JP2000 file formats
• Read-only support for the BMP, PICT, PDF, XBM and GIF file formats
• Layers with over 20 merging effects
• Individual primary and alpha channel editing
• Thorough transparency effects including semi-transparent gradients
• Arbitrary selection regions
• Anti-aliased brush strokes
• 6 basic gradient effects with 16 variations
• Tablet support
• ColorSync support (including embedded profiles in TIFFs and CMYK previewing)
• Plug-in filters