GIMP - GIMP is a multiplatform photo manipulation tool.
Fhotoroom HDR - Fhotoroom HDR is an advanced High Dynamic Range image creation and editing. Merge, ToneMapping, DeGhosting and more
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Adobe Photoshop Lightroom CC - Adobe Photoshop Lightroom CC is a commercial photo processor and image organizer.
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.
FastStone Image Viewer - FastStone Image Viewer is a fast, stable, user-friendly image browser, converter and editor.