This tool finds all pages and categories in a category tree in language X. Then, it checks all of these categories in other languages, and gets pages with a language link back to X there. It lists all pages in X that are not in the original category tree, but in the tree equivalent in other languages.
Wikipedia.
Category, depth
External depth (>0 gets more pages, but is much slower) Temporarily disabled
(Example: French scientists on fr.wikipedia)
string 'SELECT DISTINCT page_title FROM page,categorylinks WHERE page_id=cl_from AND cl_to IN ('') AND cl_type='subcat'' (length=111)
string '#0 /data/project/magnustools/public_html/php/ToolforgeCommon.php(259): ToolforgeCommon->getSQL(Object(mysqli), 'SELECT DISTINCT...', 2)
#1 /data/project/capscan2/public_html/cross_cats.php(79): ToolforgeCommon->findSubcats(Object(mysqli), Array, Array, 9)
#2 {main}' (length=265)

( ! ) Fatal error: Uncaught exception 'Exception' in /data/project/magnustools/public_html/php/ToolforgeCommon.php on line 241
( ! ) Exception: in /data/project/magnustools/public_html/php/ToolforgeCommon.php on line 241
Call Stack
#TimeMemoryFunctionLocation
10.0003231832{main}( )../cross_cats.php:0
20.0492270024ToolforgeCommon->findSubcats( )../cross_cats.php:79
30.0492271080ToolforgeCommon->getSQL( )../ToolforgeCommon.php:259