Abstract. This paper has two foci that are intended to be complementary. First, it describes Conzilla as an incarnation of a concept browser. More specifically, as a technical solution for expressing context-maps, concepts, concept relations etc. Second, it introduces Conzilla as a fairly complete RDF editor which combines graph- and form-based manipulation of RDF-graphs. Apart from these foci, the main requirements for the Conzilla design is: It should serve as a collaboration tool for more or less formalized modeling techniques, most notably UML-dialects. It should simplify the task of creating information according to various metadata standards. It should support customized presentations of existing information without requiring duplication or modification of information sources. These requirements are fullfilled by choosing a three layered approach for working with semantic web information in Conzilla, i.e. the information, presentation and style layers.