Freebiesbug is a web design blog showcasing free and high-quality design resource offering free Photoshop, Illustrator, Sketch files and more.
GraphicBurger is another large website for design freebies. You can download mockups, UI kits, icons, text effects, backgrounds and more.
Pixeden provided free and premium web design resources. The focus is on prints, icons, vectors and graphics resources.
Free Design Resources is a valuable website with a vast collection of free design resources with over 5 million downloads.
365PSD has an extensive freebie collection including UI kits, mockups, icons, buttons and other design elements.
Every icon on Icon Deposit is submitted by the best designers from around the world. It's a huge community of icon lovers.
Dribbble & Behance - over 1,000 best design freebies
...for designers, learners and techies. Weekly updated hand curated list of best articles, tutorials, freebies, code snippets and more...
Premium Pixels is a collection of free design resources created and curated by UK based Web Designer Orman Clark. All resources are offered free of charge with very little restriction.