ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Purrge - Delete iOS photos faster with drag-to-select & upward swipe
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Gemini Photos - Clean up your Camera Roll
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Photowipe - Delete photos quickly and easily from your iPhone