Broken Anchor is a tool to find various errors in contents. Primary targets was to discover broken links in node bodies. Now it's also checking comments and clear email addresses.
The module is based on a cron job in order to check, once at a time, a variable number of contents (nodes, comments for now). Each content is prepared using Drupal filters (Input Formats) in order to check the same content version as displayed.
The module comes with a report view from where it is possible to check again, edit content or ignore the error.
Content discovering is based on a kind of API allowing to extend content types able to be checked.