Ryan Welcher

This is a simple plugin that helps to clean up the admin side of WordPress by only showing the currently logged in user’s content the Post/Page/Media pages.
For the Media list, you can provide a list of user ID’s who’s Media will also be available to logged in users. It is highly recommended to create a user for this purpose.
Credits
This plugin was inspired by an article by <a href="http://premium.wpmudev.org/blog/author/pollyplummer/" rel="nofollow ugc">Sarah Gooding</a> on <a href="http://premium.wpmudev.org/blog/how-to-limit-the-wordpres-posts-screen-to-only-show-authors-their-own-posts/" rel="nofollow ugc">wpmudev</a> and uses portions of that code. Please see the source code for further details.

Restrict User Content

Limits Post/Pages/Media admin screens to only display the current user's content. Media can be shared by providing an ID list.

irenem

<h4>What is CLS?</h4>
CLS stands by it’s name. It is a conditional logic design to empower site owners to have absolute control in most areas, if not all, of their site. It provides control to modify what users can and cannot do. And control contents visibility according to user, user group, and currently use page template.
<h4>What it does?</h4>
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Set or reset users capabilities.
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Add new user group.
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Controls dashboard widgets visibilities for selected user or user group.
</li>
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Control the visibility of your posts and pages.
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Controls the visibility of your sidebars, and sidebar widgets per user, user group, and current page templates.
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Control product’s (Woocommerce) visibility and capabilities.
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</ol>

Conditional Logic Solutions (CLS)

The complete control solution for wordpress powered site.

Restrict User Content vs Conditional Logic Solutions (CLS)