This is a new watermarking app for Mac, take a look at the features below. It retails for $9.99/£5.99 and you can download it here.
• Automatically add high-quality watermarks to your photos
• The original photos are not altered • Watermarks can be dragged to the location of your choice and can easily be resized
• Adjust opacity, color, font and angle
• Watermarks can be saved as presets for re-use
• Create a watermark in the app or import it from an image or an RTF-file
• Support for custom export formats