imgix - Real-time Image Processing. Resize, crop, and process images on the fly, simply by changing their URLs.
PhotoPenguin App - PhotoPenguin is a completely free batch photo editor with support for cropping, resizing, adding watermarks, and converting photos to other formats. It works on the user's device, using the capabilities of modern browsers.
Cloudimage - Cloudimage.io is the easiest way to resize, store, and deliver your images to your customers through a rocket fast CDN.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Sirv - Dynamic image processing, hosting and rich-media for retailers and eCommerce.
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats