I've been trying to figure this problem out but can't quite find an answer.
On my WordPress site, the URL for tags is mysite.com/tag/tag-term. This displays fine using the tag.php template. However, If I just go to mysite.com/tag/ I get a 404 error. It is the same for custom taxonomies I have. For example, I have custom taxonomy of developer so if I goto mysite.com/developer/term it loads content under that term using taxonomy-developer.php template. But going to mysite.com/developer/ returns a 404.
Is there a template I can use, or some other method to get Wordpress to display a list of terms if someone goes to the /tag/ or /taxonomy/ part of the URL?