last-updated – The unofficial WordPress Plugin Directory

PostDates

Display the publication and last update dates on your posts, pages, and custom post types. You can choose which dates and its location.

Notifies when the difference between the blog last modified date and the current date exceeds a certain period.

Mark posts as significantly updated an display them in a widget.

Use Post Updated Date Plugin to display the Last Updated Date in WordPress Posts.

This plugin adds 2 columns to the admin plugin's page to show when each plugin was last updated and upgraded.

Show modified date column in the lists of pages and posts in the WordPress admin panel.