| 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. |
| Feed Validator for RSS and Atom: Provides schema-based online validation for Atom and RSS feeds and a large testsuite for developers of similar tools. |
| Feedvalidator-users Email List: Questions, bugs, patches, and general discussion of FeedValidator.org's Atom and RSS feed processing service. |
| Redland RSS 1.0 Validator and Viewer: Enter the address of an RSS 1.0 feed into the form, and it will be validated and formatted for display. |
| RSS1.0 Validator (ldodds.com): An experimental online RSS1.0 Validator |
| Userland RSS validator: Userland Software's online validator for RSS 0.9x |
| W3C RDF Validation Service: A full RDF Validation Service - for use with any RDF, not just RSS 1.0 |
| Will the real RSS validator please stand up? [dive into mark]: Elaborates on how the RSS community is in disagreement about the exact format for RSS feeds and individual entries. |