LR2/Mogrify by Timothy Armes is easy to use Adobe Lightroom plug-in is for those that want and need some pre-publishing work.
“LR2/Mogrify is a post-process plugin for Lightroom 2 and later that can embellish your images as they are exported from Lightroom. It’s flexible interface allows you to add outer and inner borders, watermarks and text annotations to your images.”
Personally, I use this export utility plug-in for adding Event/Location and Copyright info before posting to various services (Facebook, Flickr, Stock Agencies, etc.).
“ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.”