Shutterstock - Shutterstock is a provider of stock photos, illustrations, and vector art. The website allows individuals to purchase a subscription and download copyrighted art for creative projects. Read more about Shutterstock.
Sketch - Professional digital design for Mac.
Snapwire - Real photos by real people
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Pixabay - Over 270,000 free photos, vectors and art illustrations
Affinity Designer - Professional creative software, exclusively for Mac.