Photoshop.com - Photoshop.

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.

piZap - Free online photo editing software.

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

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

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