detect-external-link
Node.js plugin that analyzes the given link and determines if the URL is internal or external.
markdown-it-external-links
Plugin for markdown-it that adds CSS classes to links that fall outside of the specified internal domain(s).
remarkable-external-link
Remarkable plugin that adds `target` and `rel` attributes on external links. Also, provide ability to insert text/html inside and/or outside a link.
hexo-safego
✨Hexo plugin for safe external link redirection with base64 encoding, domain whitelisting, and support for a custom redirect page.