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.