Hue - Unlimited design for startups to enterprises
Artboard Studio - Online graphic design app mainly focused on product mockups.
Feather Icons - Simply beautiful open source icons
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.
IconBros - Free and continuously growing high quality icons