Creative Market – “Buy and sell handcrafted, mouse-made design content like vector patterns, icons, photoshop brushes, fonts and more at Creative Market. Ready-to-use design assets from 22,211 independent creators including graphics, fonts, themes, photos and more, starting at $2!”
This one is mostly for design. When you signup with them you will get a lot of emails, but all you have to do is go to your Account Settings and deselect everything but “Get new Free Goods each week”. Their free stuff includes fonts, clipart, vectors, templates, brushes, mock-ups, backgrounds, and more.