Image Tuner is a free batch image resizing, renaming, conversion and watermarking tool with an intuitive UI. If you are looking for a tool that will be able to do everything you need to do with images every day, missing Image Tuner would be a crime!
Batch Watermarker is a powerful tool that helps you create watermark/overlay to protect your intellectual properties. Batch Watermarker can add watermarks (either image, text, or both) onto your graphic files in batches.