Upgrade http:// Links to Your Own Site to https://
Rewrites old http:// links and images pointing to your own domain to https:// when content is displayed, fixing "not secure" mixed content warnings after moving to SSL without editing every post.
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.