Allows to cross join entities in Views. This is an essential tool to bring in not related data. For example you want to display two nodes in the same row, but there is no reference between them. Then you could cross join all nodes. Important all nodes get joined in, so you need to limit the result with filters and arguments.
This project aims to calculate the ranking between users depending on their User Points.
It is integrated with Views. You could access the results by Views and you could setup for each user point category a View which limits the ranking between users to a specific subset of all users. This allows you for example the ranking of user groups. See also for that Organic Groups.