IsaViz, a visual environment for browsing and authoring RDF models represented as graphs featuring: a 2.5D user interface allowing smooth zooming and navigation in the graph, creation and edition of models by drawing ellipses, boxes and arcs, RDF/XML, Notation 3 and N-Triple import, RDF/XML, Notation 3 and N-Triple export, but also SVG and PNG export. Since version 2.0, IsaViz can render RDF graphs using GSS (Graph Stylesheets), a stylesheet language derived from CSS and SVG for styling RDF models represented as node-link diagrams.