Splashroad Separation Studio - Quick and Easy Color/Shape Separation
Easy Poster Printer - Ever wanted to create your own poster?
Vectoraster - Generate custom vector halftones, line rasters and gradients
Rasterbator - Wall art from any image
Posterizer - The rasterbator allows you to create posters larger than a standard page, using the tiled printing method. It will rasterize any image and output files that can be printed at home and reassemble to the original image.
poster - Unofficial client for Instagram mobile experience on Mac.