Google Forms
- Simplicity in design, keeps limited options available to users that likely cover the vast majority of needs.
Trello
- Intuitive interface, you can pretty much guess at how to do things and you'll probably be right.
https://www.theguardian.com/news/series/ten-best-photographs-of-the-day
- High-quality content, appropriate focus on what matters, leads the user further into the site
Pandora
- Very simple interface to get exactly what you want
Adobe Color Explore
- Like pandora, very simple interface to get what you want. Puts the important content up front.