AIGA Design Archives is one of the richest online resources available to those who practice, study, and appreciate great design. Dating back to 1924, it includes more than 20,000 selections from AIGA's national juried design competitions
News, commentary, podcasts about design tools and trends. Emphasis is on Google products: Material Design, Android OS, and more. The Resources tab links out to fonts, icons, color palette generators, and more tools.
Free library of hand-drawn human illustrations. You can mix these elements to create different Peeps. Use in product illustration, marketing imagery, comics, product states, storyboarding, etc.