Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
GIMP - GIMP is a multiplatform photo manipulation tool.
ResizePixel - Free image editor to crop, resize, flip, rotate and convert images online
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Bulk Resize Photos - Resize large photos in bulk
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
Dribbble Resizer - Resize your designs for sharing on Dribbble