RDF Editor is available here: http://loki.ia.agh.edu.pl/RDFeditor/
You can also download it and install on your own server.

Note: It is recommended to use it in Firefox web browser. There are some issues with Google Chrome.

HTML5-based RDF editor and visualisator:

• RDF/XML import/export.
• Possibility to manipulate the nodes (text, datatype, placement). Own format RDFT (*.rdft) which saves RDF model along with all elements placement information.
• Possibility to load RDF/XML, manipulate it (add/remove/modify elements) and then export it to RDF/XML.
• Possibility to create RDF/XML file by the use of a graphical editor.
• Visualisation compatible with W3C RDF Validator.
• Non limited zoom-in and zoom-out.
• Visibility filters based on URI/literals/ganId (whole, partial).
• Graph export to PNG and SVG.
• Size of nodes is automatically adjusted to the text.

After selecting RDF content option, the text editor appears along with Clear and Build model buttons. One can simply copy-and-paste the RDF model in one of three supported syntaxes:

• RDF/XML (sample file)
• N-Triples (sample file)
• Turtle (sample file)

Successful completion of model building results in the appropriate diagram and the list of triples.