Placeit Unlimited - 12,000 smart design templates for $29
OpenDesign.dev - Read and display data from designs, using code
Mockup Mark - Realistic apparel mockups for ecommerce, social & more
Proximity School of Design - Design school & design pattern library
Merch by Amazon - Create, sell, and promote custom branded t-shirts
Eagle App - Unify your creative inspiration in one place. Store anything – inspiring images, design mockups, illustrations, screenshots and more.