Boxed Design UI Kit
Boxed Design UI Kit is Adobe Xd freebie.
Boxes design is also known as cards. They are fast becoming the best design patterns for aggregated content, images, videos, social across all platforms, screen sizes and mobile devices in responsive web design.
Cards are great when it comes to displaying heterogeneous content in one page — the borders of cards resemble physical cards and indicate how much content each card contains. Cards can also communicate a wide spectrum of screen interactions like swiping, scrolling, tapping and clicking. When we use cards in interfaces, we want to be diligent about when and where cards are used.