Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
ShoeBox - Free unlimited photo storage, so you can rediscover your photos anywhere. Available for iPhone, iPad, Android, Mac and PC.
GIMP - GIMP is a multiplatform photo manipulation tool.
TexturePacker - Texture Packer is hands down the best sprite sheet generation tool on the market.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Free Texture Packer - Free Texture Packer is an open source tool that allows you to pack multiple images into one atlas for you games or sites.
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.