The demo
The Sparnatural Demo page, at /demo, lets you try the query builder without an account, a deployment or a token.
It queries the public DBpedia SPARQL endpoint, with a small fixed choice of concepts: Person, Place and Country. Everything else works as on a real deployment: the SPARQL editor shows the generated query, and the results table shows the answers, shortened with the common prefixes only.
The demo does not touch your Agrafe projects. To query your own data, deploy a project in Agrafe and connect to it.