Already some time ago, AKSW’s Ali Khalili was releasing an open-source version of the RDFa Content Editor (RDFaCE). RDFaCE is based on the Web HTML Editor TinyMCE and supports different views for semantic content authoring. It uses existing Semantic Web APIs to facilitate the automatic annotation and editing of RDFa content embedded in HTML. All information about RDFaCE can be found at the project page:
An online demo is available at: http://rdface.aksw.org
We want to thank Ontos AG (and in particular Daniel Hladky) for their support and contributions to RDFaCE.