timlinden

Remembering to post every day, and which days you already posted, is super easy with this plugin. 
It shows you a calendar with days red when there isn’t a post, and days green when there is. Green 
days you can hover over and see the title of the post, and click to edit the post for that day.

wpFutureCal

A simple calendar that displays when you edit posts, showing which days you have posted on.

benplum

Presswell

Presswell Publication Schedule adds precise, automated control over how often new posts are published, and is the perfect solution for ensuring a consistent editorial calendar. Simply configure the days and times when posts should be published and new posts will be automatically scheduled for the next available time slot.
Features
<ul>
<li>Automatically schedule posts based on simple day and time rules</li>
<li>Ability to override scheduled date for Admins and Editors</li>
<li>‘Publish Now’ actions for Admins and Editors</li>
</ul>

Presswell Publication Schedule

Simple and precise post publishing control for WordPress based on day of the week and time of day.

wpFutureCal vs Presswell Publication Schedule