Ontological

Extremely Annotational RDF Markup (EARMARK) is an ontological approach to the specification of markup structures on text content. It allows not only documents with single hierarchies (as with XML) but also multiple overlapping hierarchies. Platforms: Windows, Mac, Linux

OntoUML Editor is a model-based graphical editor that supports the creation of conceptual models and domain ontologies in a philosophically and cognitively well-founded modeling language named OntoUML, which is based on the Unified Foundational Ontology (UFO). The editor is designed in a way... Platforms: Mac