Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
PhotoFlare - Quick, simple but powerful Cross Platform image editor.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Fresh Paint - Microsoft's new painting software with more realistic brushes for Windows 10
showFoto - ShowFoto is the standalone image editor of the digiKam project.