It's something that doesn't exist in Mendix yet, but it would be an awesome addition to have in our platform. I would call it "Matrix" widget.
What can this widget do?
1. It shows a list of objects vertically
2. Each vertical shown object can show a list of objects horizontally
this will result in a matrix where we can have an unending vertical list and an unending horizontal list.
Of course this can be realised if we put one list view in another list view and apply some styling, so the second list view shows the objects vertically. This is a lot of work and doesn't feel very handy to develop due to custom styling etc.
When I take a look at how our competitors do it, it really makes me want this in Mendix as well:
A way to export this would be great aswell