In the latest of our ongoing Reports enhancements, users can now summarise related data “on the fly” by creating a “Summary Value” field directly within a report rather than needing an Admin to create a “Rollup” field and place it on the Form for every record.
A “Summary Value” field could be used to sum all “Open Opportunities” for an “Account” (as shown below) or count the number of activities linked to “Won Opportunities“.

