LH Tools is a wordpress plugin that enables a sparql endpoint for for WordPress sites. This will enable semantic querying of WordPress data.
You can add custom rewrite endpoints from admin page.
This plugin enhances Wordpress REST API v2 responses about metadata
Make Connector.
Make lets you design, build, and automate by connecting with WordPress in just a few clicks.
Add WordPress API endpoints and access your site's data in JSON, XML, RSS/ATOM, YAML or HTML.
Enable a UI to toggle visibility and customize properties in WP REST API requests.
WordPress meets APIs: Get API-data and show it with a Shortcode or a JCI Block. Generate a template with the JCI Block. New: ContactForm7 Integration
Rest Routes is the ultimate solution for adding custom endpoints to your WordPress REST API effortlessly.