How to run a sparQL query?

I discovered the SparQL syntax at the Mozilla Festival 12.

The demonstrator was using a proprietary web-based interface and I was wondering if there is open services or maybe (cross-platform) GUI application ? In order to :

1. write your query ;
2. execute the query ;
3. explore the results.

Some kind of SparQL IDE.

Here is what I found :

Cross-Platform (Linux/Windows/Mac?)

• Twinkle (Java)
• sparql-aderis (Java) :
  • provide CLI interface ;
  • last build 2010.

Windows-only

• SparqlGUI (requires .NET; installed as part of the dotNetRDF tools installer) ;