Ideas
Letterboxd for Art Museums
Diary app
That has native integration with Photos.app, so I can associate a few favorite photos with the day.
Annotated World Wide Web (AWWW)
I want a good set of tools for annotations, mostly for web articles, but it should be able to store book quotes, podcast notes, etc.
I also want a minimal set of social features around it. A public page that shows the feed of my annotations. I can follow people to see a feed of their annotations.
Video game set in 17th century Amsterdam
Delivering packages to Rembrandt, finding Vermeer's Little Street.