Software Libraries
JavaScript
Green Turtle is a RDFa 1.1 implementation written in pure JavaScript that runs in the browser.
PHP
EasyRDF is a PHP library for extracting RDFa and working with RDF, in general. You must use the latest development version if you want the RDFa parser: download the latest 0.8 snapshot.
Python
PyRDFa is a Python package for extracting RDFa from Web documents; it is based on the Python RDFLib package.
Ruby
The RDFa gem for the Ruby RDF software stack.
C
librdfa is the fastest RDFa processor in the world.
Clojure
clj-rdfa is an RDFa extractor implemented in Clojure running on a Java Virtual Machine.
Java
semargl is a highly performant RDFa parser. Jena, Clerezza, and Sesame integration. Android and GAE support.
RDFa Test Suite

The RDFa Test Suite is useful for validating RDFa Processors against the official test suite for RDFa 1.0 and RDFa 1.1. Languages supported include HTML5, XHTML5, XHTML1, HTML4, SVG and XML.

Version and Host Language specific test manifests may be found here: