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Canva Pro - Millions of design assets, templates and images all in one

Mr. Mockup - Mr.

Creative Market - Buy and sell handcrafted, mousemade design content like vector patterns, icons, photoshop brushes, fonts and more at Creative Market.

Pixeden - Pixeden is an all-in-one premium design and web resources platform that provides high-quality graphic design templates and lots of other files.

Pixelify - A new way to download and share free design assets