parent-page-filter

doesn't work on custom post types

unable to filter pages with no parent

It's a simple plugin and does the job, but only if WP_DEBUG is disabled. The two main issues I have with this plugin are: It assumes that $_GET['post_type'] exists and/or is set, when it mightn't, which throws PHP warnings and sometimes actually halts page load, here and here. Not ready for translation (I am happy to patch by the way, a GH repo would be nice)

Nice Plugin