dmallon

The Post To Sidebar plugin makes it easy to display post content in the sidebar areas of your site. Once the widget is activated, a multi-select dropdown of all your published pages appears on post editing screens. Select the pages upon which you want the post to be displayed and the post will appear on those pages.
There are options to hide the post title in the output and to show the content as an excerpt.

Post To Sidebar

A WordPress plugin/widget that gives you the ability to put content (posts and custom post types) in your sidebar.

Grant Mangham

Express posts provides a widget to display either a subset of posts, the children of a page or its siblings.
The widget provides three modes.
Subset will list a given number of posts from your selected categories. Date, date format, and excerpt are all optional.
Children and siblings modes will list the immediate children or siblings of a page, respectively. You can include a placeholder in the widget title as a substitute for the parent page title. You can also choose to show or hide the widget on specific generations of pages, allowing extra flexibility on shared sidebars.
In common with all of my plugins, Express Posts strives to follow best practice in WordPress coding. If you spy a bug or see room for improvement, please <a href="https://wordpress.org/support/plugin/express-posts" rel="ugc">let me know</a>.

Express Posts

Express posts provides a widget to display either a subset of posts, the children of a page or its siblings.

Post To Sidebar vs Express Posts