- Feedvalidator-users Email List - Questions, bugs, patches, and general discussion of FeedValidator.org's Atom and RSS feed processing service.
- Feed Validator for Atom and RSS - This is a validator for syndicated feeds. It works with RSS 0.90, 0.91, 0.92, 0.93, 0.94, 1.0, and 2.0. It also validates Atom feeds.
- W3C RDF Validation Service - A full RDF code Validation Service - for use with any RDF, not just RSS 1.0