A.I. Gigapixel - AI based image resizer
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
waifu2x - Online/Offline tool to upscale images
Ralpha Image Resizer - High-speed image batch conversion tool
Photozoom Pro - BenVista PhotoZoom Pro 7 creates perfect image enlargements and increases photo resolution at high quality using our patented S-Spline Max interpolation algorithm
FastStone Photo Resizer - Convert and Rename images in batch mode Support JPEG, BMP, GIF, PNG, TIFF and JPEG2000