Semantic Radar is a plug-in for Firefox, notifying the user if it finds SIOC, FOAF or DOAP data referenced by the page he is currently viewing. When such data is detected a little icon will appear on the bottom right side of you browser, which lets you access the embedded data easily. Semantic Radar is very handy, great to see what data is available from a page without having to view source. For a Web developer working with linked data it’s a must-have. The design seems a good balance of features.

Read the full review here