Canva for iPhone - Create beautiful designs in seconds – now on your iPhone
Artboard Studio - Online graphic design app mainly focused on product mockups.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.
Snappa - The perfect graphic design tool for digital marketers.
PIXELIXE Studio - Pixelixe makes it easy to create and edit any type of online graphics. For social media, blogs, ads, and more!