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.
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.