Quarry (https://quarry.wmflabs.org/) is a web service where people can make SQL queries and share these queries and the result. It's a really nice service to get to know SQL.
Since ~2015 we have the Wikidata Query Service (https://query.wikidata.org/) which uses SPARQL. Not a lot of people know a lot of SPARQL so having some sort of service like Quarry, but for SPARQL, would make it a lot easier to use this service.
Proposed name is sparqly, but we can always bike shed over a better name.