Downloading RDFConvert 0.4.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This free software for Mac OS X was originally developed by Jeen Broekstra. RDFConvert for Mac is included in Productivity Tools. We recommend checking the downloaded files with any free antivirus.
From the developer:
RDFConvert is a simple command-line tool for converting RDF files between different syntax formats. It is based on the OpenRDF Rio parser toolkit. The app currently supports RDF/XML, Trig, Trix, Turtle, N3, N-Triples, RDF/JSON, JSON-LD, Sesame Binary RDF, and N-Quads.
You may want to check out more Mac applications, such as PitStop Extreme, FileOpenInstaller or Blurb Tally, which might be similar to RDFConvert.