A widget that displays a list of scheduled posts with links to the posts.

Ayuda WordPress

Fernando Tellado

Scheduled Posts Showcase

Display your scheduled and future posts on the frontend without generating 404 links. Show visitors what's coming next.

Aaron D. Campbell

Upcoming Posts Widget

A widget that displays a list of scheduled posts.

rickacc

Linked Future Posts Widget acts very much like the upcoming posts widget by displaying 
scheduled posts instead of published ones, but includes a link to each post (using slug/post name). Requires WordPress 2.8+
Use this plugin in conjunction with the Future plugin from Marion Sudvarg to create a Post Grid of scheduled events and a list of scheduled 
events on the post page. Events that change from scheduled to published status will automatically be removed from the grid and list.
Linked Future Posts Widget is a derivative of the Upcoming Posts Widget plugin created by Aaron D. Campbell.

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