ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
A.I. Gigapixel - AI based image resizer
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
AI Img Enlarger - Enlarge Images Without Losing Quality Online
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