Personalization for Accessibility
I'm looking for web apps or online experiences that offer personalization options to users with the intent to improve accessibility, such as increased font-size, variable color scheme or layout (for example, always give me mobile). Thoughtful implementations would persist after users leave the site, so their desired settings would still be there when they came back.
Trello has an "Enable Color Blind Friendly Mode". It's pretty simplistic and probably not that useful, but their hearts are in the right place.
Have you seen any applications that do well with this type of offering?