find command knows how to show broken symlinks:
find . -xtype l
This was useful to me when combined with Git Annex. Its
wanted option allows you to have a “sparse” checkout of
the content, and save space by not having to copy every annexed file locally:
git annex wanted . 'exclude=Music/* and exclude=Videos/*'
find any broken symlinks outside those directories by querying with
Git Annex itself, but
find . -xtype l works on other places too, where broken
symlinks might be a problem.