Posts By Tag is a plugin for WordPress that makes it easy to insert lists of tagged posts into pages and posts.
For example, I have dozens of posts tagged “Batman.” With the Posts By Tag plugin, I can insert a list of all posts with that tag by using the short code: [posts-by-tag tags = "Batman" number = "999"]
This will insert a bulleted, hyperlinked list to all of the posts I’ve written with that tag.