Steve Grunwell

<a href="https://codex.wordpress.org/Excerpt" rel="nofollow ugc">WordPress post excerpts</a> can be a great way to hand-craft the summary of your content. Unfortunately, writing post excerpts isn’t as nice of an experience as what you find elsewhere in WordPress. Want to include links in your excerpts, or bold some text? Hopefully you know some HTML!
Advanced Post Excerpts is designed to change that, by giving your editors an easy, intuitive interface for writing great post excerpts.
For complete details and/or to contribute to ongoing development, please <a href="https://github.com/stevegrunwell/advanced-post-excerpt" rel="nofollow ugc">visit this project on GitHub</a>.

Advanced Post Excerpt

Replace the default Post Excerpt meta box with a superior editing experience.

Adam Harley (Kawauso)

Enables excerpts as a feature of the ‘page’ post type, adding the Excerpts meta box to the Edit Page view automagically. This readme is about as long as the entire plugin.

Page Excerpts for WordPress Three

Add excerpts to pages the WordPress 3.x way. Less code, less overhead.

Advanced Post Excerpt vs Page Excerpts for WordPress Three