Lots of Tools

(Graphical) Editors:
- IsaViz (Xerox Research/W3C), RDFAuthor (Univ. of Bristol), Protege 2000 (Stanford Univ.), SWOOP (Univ. of Maryland), Orient (IBM)
- IsaViz (Xerox Research/W3C), RDFAuthor (Univ. of Bristol),
  Protege 2000 (Stanford Univ.), SWOOP (Univ. of Maryland)
  
  Orient (IBM)
Programming Environments:
- Jena (for Java, includes OWL reasoning), RDFLib (for Python), Redland (in C, with interfaces to Tcl, Java, PHP, Perl,…), SWI-Prolog, IBM’s Semantic Toolkit, …
- Jena (for Java, includes OWL reasoning), RDFLib (for Python),
  Redland (in C, with interfaces to Tcl, Java, PHP, Perl,…),
  
  SWI-Prolog, IBM’s Semantic Toolkit, …
Triple based database systems:
- Kowari, Tucana, Sesame
RDF and OWL validators:
- http://www.w3.org/RDF/Validator/, http://owl.bbn.com/validator/
Ontology converter (to OWL):
- http://www.mindswap.org/2002/owl.html
The list gets longer every day! You can always start with:
- http://www.w3.org/RDF/#developers

Isn't This Research Only? Lots of Tools