GIMP - GIMP is a multiplatform photo manipulation tool.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Wondershare PDFelement - All-in-one PDF editor
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.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.