Chrome //
Extensions 
Chrome
Web store 
Schema Builder for Structured Data
Easily build validated json-ld structured data markup for any webpage. Based on schema.org specification
Salesforce Tool Suite (Debug Logs, Schema)
Build complex Salesforce SOQL rapidly, monitor debug logs, and launch without sharing your passwords from any Salesforce tab.
Validate Schema in Schema Markup Validator
Open the current tab in Schema.org Validator by Break The Web
Salesforce Schema Builder Expander
Expands Salesforce schema builder to have more real estate to visualise