TopBraid Composerâ„¢ is an enterprise-class platform for developing Semantic Web ontologies and building semantic applications. Fully compliant with W3C standards, Composer offers comprehensive support for developing, managing and testing configurations of knowledge models and their instance knowledge bases. Composer provides a flexible and extensible framework with a published API for developing semantic client/server or browser-based solutions, that can integrate disparate applications and data sources.
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This is definitely a great application for anyone that needs to create semantic web solutions. It has many components for refactoring and it comes packed with pre-configured building blocks. The RDF editor (my personal favorite) is pretty neat especially because of the auto complete function that types proprieties and resource names for you.
Anyway, if you're not ready to pay $500 for it try the 30 day evaluation version. You might fell in love with it.
Several features make TBC stand out from any other product in this space, including:
-support for multiple back-ends
-import and export capabilities to a variety of different formats
-integration with Eclipse
-professional support
-ease of working with multiple ontologies, refactoring, viewing and moving triples, mapping models, etc.
-SparqlMotion scripts for creating data processing chains
-one click deployment into the TopBraid Live server platform
and so on