RDF Environments (interpreters, etc)
  - Jena (from HP; for Java,
    includes OWL reasoning)
- RDFLib (for Python)
- Redland (in C, with
    interfaces to Tcl, Java, PHP, Perl, …)
- Sesame (RDF
    Schema based repository and querying facility)
- cwm
    (general-purpose data processor for the semantic web)
- Protege (ontology
  editor)
- Access to
    Relational Databases (white paper)
- Annotea (annotation of
    Web documents)
SemWeb Graphical Editors