Free and open source
Tools
Small, focused tools for migration work. Free, MIT licensed, no signup, and none of them connect to your site.
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Drupal 7 migration inventory scanner
Point it at a Drupal 7 codebase and get back what is in there that forces a migration decision — custom code that no longer exists in Drupal 10, custom fields and entities, URL and file handling, permissions — plus the real Drupal 10/11 release status of every contributed module, measured from drupal.org. One file, no dependencies.