RawTherapee - RawTherapee is a free RAW converter and digital photo processing software.
Sketch - Professional digital design for Mac.
Darktable - darktable is an open source photography workflow application and raw developer.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
digiKam - Professional Photo Management with the Power of Open Source
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.