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.

Photoshop.com - Photoshop.

ImBatch - ImBatch is a batch image processor with a nice graphical user interface.

piZap - Free online photo editing software.

Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats

Phixr - Phixr is a free online photograph proofreader, an instrument for editing your photos in your web program.