similarity

http://drupal.org/project/content_access
http://drupal.org/project/nodeaccess
I think there are some more access / permission UI modules but those two look for me nearly absolutely identical except content_access uses ACL for user permissions.

BTW: I see sometimes a block "Recommendation: Related projects" when accessing projects.. who is maintaining those information? Is it automatically tag based? Because in both cases each other isn't showing up.