ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.
Ralpha Image Resizer - High-speed image batch conversion tool
Corel AfterShot Pro - Say hello to Corel AfterShot Pro 3, the world’s fastest photo workflow tool! Edit your photos up to 4x faster than Lightroom so you can spend more time behind the camera. Download a free 30-day trial today!
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!