Google Rich Results Testing Tool
Google Structured Data Testing Tool
Yandex Structured Data Testing Tool
Structured Data Linter
RDF to SVG Bookmarklet
Bing Markup Validator
Apple App Search API Validation Tool
Open Graph Debugger
RDFa Play
Microdata Parser
Google Data Feed Validation Tool
JSON-LD Playground
Schema-DTS
Email Markup Tester
OpenLink Structured Data Sniffer
Microdata.reveal
Microdata/JSON-LD sniffer
Semantic Inspector
META SEO Inspector
Green Turtle RDFa
RDF Translator
Convert RDFa to JSON-LD
Convert Wikipedia URL to DBPedia URL
Wikidata Lookup by Name
Sindice Web Data Inspector
Corporate Contacts Markup Tester
Event Markup Tester
