With this application you can add several lines of text comments to an image, save the image and text as a single pdf or jpg file, rotate the image, change the background and add a border, change the text position, size, font, colour and orientation, and open images by dragging or by pasting an image clip.
TextnPic is totally free. It works on Mac OS 10.4 or later and requires a screen size of at least 800x600. It has two window sizes, allowing for different amounts of text. Help is available within the application.