Unpublish Posts on an Expiry Date
Adds an "Unpublish on" date box to the post editor and moves expired posts back to draft automatically, for time-limited offers and announcements.
Snippet Library
Content snippets for WordPress
Snippets that add to or change your posts and pages: reading time, author boxes, “last updated” notes, content after the post or after a paragraph, and excerpt tweaks. For bloggers, publishers and anyone who wants richer posts without editing theme files.
Unstick Sticky Posts Automatically After a Few Days
Removes the sticky flag from posts a set number of days after they were made sticky, so featured announcements do not stay pinned to the top of the blog forever.