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The OpenCyc Platform is your gateway to the full power of Cyc, the world's largest and most complete general knowledge base and commonsense reasoning engine. OpenCyc contains hundreds of thousands of Cyc terms organized in a carefully designed ontology. Cycorp offers this ontology at no cost and encourages you to make use of, and extend, this ontology rather than starting your own from scratch. OpenCyc can be used as the basis of a wide variety of intelligent applications ..

"UMBEL Concept Plain Tagger This plain tagger uses UMBEL reference concepts to tag an input text. The OBIE (Ontology-Based Information Extraction) method is used, driven by the UMBEL reference concept ontology. By plain we mean that the words (tokens) of the input text are matched to either the preferred labels or alternative labels of the reference concepts, with the match basis denoted by color. The simple tagger is merely making string matches to the possible UMBEL reference concepts."

RDF Gravity is a tool for visualising RDF/OWL Graphs/ ontologies.

"Semantic Content Engine The word ontology has many definitions, but for content management and computer science, Wikipedia refers to it as: "a model for describing the world that consists of a set of types, properties, and relationship types.""

Karma is an information integration tool that enables users to quickly and easily integrate data from a variety of data sources including databases, spreadsheets, delimited text files, XML, JSON, KML and Web APIs. Users integrate information by modeling it according to an ontology of their choice using a graphical user interface that automates much of the process.

Gatfol is an ontology-free, massively scalable, patented algorithm technology that acts as librarian between humans and data. Gatfol allows us to talk to- and reason with unstructured data everywhere.

LOV, your entry point to the growing ecosystem of linked open vocabularies (RDFS or OWL ontologies) used in the Linked Data Cloud. Here you will find vocabularies listed and individually described by metadata, classified by vocabulary spaces, interlinked using the dedicated vocabulary VOAF. You will enjoy querying the LOV dataset either at vocabulary level or at element level, exploring the vocabulary content using full-text faceted search, and finding metrics about the use of vocabularies in the Semantic Web.

"OSF can integrate and manage all types of content - unstructured documents, semi-structured files, spreadsheets, and structured databases - using a variety of best-of-breed engines. All external content is converted to the canonical RDF data model, enabling common tools and methods for tagging and managing all content. Ontologies provide the schema and common vocabularies for integrating across diverse datasets."

"Domeo is an extensible web application enabling users to visually and efficiently create and share ontology-based stand-off annotation on HTML or XML document targets. The tool supports manual, fully automated, and semi-automated annotation with complete provenance records, as well as personal or community annotation with access authorization and control."

"Wandora is a general purpose information extraction, management and publishing application based on Topic Maps and Java. Topic maps are hypergraphs with an emphasis on subjects. Wandora stores information in layered and auto-merging topic maps. Wandora has graphical user interface, multiple visualization models, huge collection of information extraction, import and export options, embedded HTTP server with several output modules and open plug-in architecture. Wandora is a FOSS application with GNU GPL license. Wandora suits well for constructing and maintaining vocabularies, ontologies and information mashups. "

"The Sigma knowledge engineering environment is an system for developing, viewing and debugging theories in first order logic. It works with Knowledge Interchange Format (KIF) and is optimized for the Suggested Upper Merged Ontology (SUMO)."

"WebProtege is developed by the Protege team in the Biomedical Informatics Research Group (BMIR) at Stanford University, California, USA."

smart Ontology management

OWLIM is a family of semantic repositories, or RDF database management systems, with the following characteristics: native RDF engines, implemented in Java delivering full performance through both Sesame and Jena robust support for the semantics of RDFS, OWL 2 RL and OWL

Semantic Data Wiki and Linked Data Publishing Engine

"Search as a Service: Information Intelligence for Big Data, Web & News"