ResizePixel is a free online image editor where simplicity is essential feature. It is designed to crop, resize, flip, rotate and convert images to various formats. The service is mobile-friendly, fast and easy to use.
piZap - Free online photo editing software.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Fun Photo Box - FunPhotoBox is a free photo editing device where you can make clever pictures from your photographs.
Ralpha Image Resizer - High-speed image batch conversion tool
Photoshop.com - Photoshop.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.