Ever wanted to do some complex roll-ups with scalability in Salesforce?
Option 1. Write Apex
Option 2. Einstein Analytics or other such solutions
Now we may have option 3
Check out what James Simone has done for the Ohana with this very interesting and useful project
And since it can be used from both declarative and Apex, you have the option of rolling up complex relationships the way you like
Check out the link in comments - Because don't we all need to get some totals for those TPS reports
Thanks to Chad Kelly for sharing this nugget.
Github library link http://bit.ly/2K4k5pU