• behance (design projects)
• dribbble (design shots)
• brand new (branding analysis)
• art of the menu (menu showcases)
• .pulse (design principles)
• pexels (stock photos)
• artboard studio (free browser mockups)
• colorable (acessibility in color contrast)
• sharpen (design challenges!)
• open doodles (doodles with a free license!)
• ouch! (free vector illustrations)
• undraw (free illustrations)

┊ more:

• mockups
• google fonts
• font awesome icons
• fonts i like
• font pair