Open Cyc - OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine. Protégé - A free open-source Java tool providing an extensible architecture for the creation of customized knowledge-based applications. Includes documentation, events and publications. Ontology Building: A Survey of Editing Tools - Survey of ontology editing tools summarizes more than 50 software tools and provides a brief introduction to the topic. Includes resources. Apollo - A knowledge modelling Java application developed by the Knowledge Media Institute. Internal model is build as a frame system conformant to OKBC protocol. Version 1.1 supports OWL. Dumpont - A simple web service allowing to display class and property hierarchies from a DAML or OWL file. EON2002 - Evaluation of Ontology-based Tools - Program and Proceedings of OntoWeb-SIG3 Workshop at the 13th International Conference on Knowledge Engineering and Knowledge Management. WordMap Taxonomy Management Software - Allows an organisation to ensure semantic interoperability of metadata, through consistent terminology in all of its applications, assets and activities. RACER System - A Semantic Web inference engine for developing ontologies and query answering over RDF, RDFS/DAML or OWL. F-OWL - An ontology inference engine for OWL, using Flora-2, an object-oriented knowledge base language and application development platform. pOWL - pOWL is web-based knowledge base edititing and management solution for the Semantic Web. It supports collaborative browsing, querying and editing of RDFS/OWL Ontologies and exposes an API for PHP programmers. Distributed Ontology Management Environment - DOME is developed by the Ontology Management Working Group. The aim is to provide tooling support for editing, browsing, versioning, evolution, mapping and merging of ontologies.