Free & open source image editor similar to Photoshop
Free full-featured vector graphic design app that works on ALL platforms
Open source, free animation, 3D modeling, etc.
Cross-platform raw image processing program
Online design program
Sketching and painting program designed for digital artists
GUI prototyping software
Powerful free design tool
Free design tool from Adobe
Icons that can be used as code in your projects
Sketch for Windows
Free screen designing tool from InVision
Free & Open source photography workflow application and raw developer
Free Photo Editor: For windows only
Open Source colors software: Retrieve, manipulate and store your colors easily!