D4Classifier
The D4Classifier is unique in that it deftly handles multi-dimensional metatags and is designed to work in concert with the D4Core API. Web-based, so there's no software to install, the D4Classifier is a good choice for those without an existing logging solution.
Already have your content tagged? Our D4Controller can be used effortlessly from within your existing workflow to import your tags into our D4Core API.