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.

Jason Coleman

Paid Memberships Pro

Jared Atchison

<h4>Add an avatar upload field on frontend pages and Edit Profile screen so users can add a custom profile picture.</h4>
Community and Membership sites on WordPress use this plugin as a lightweight solution for custom user avatars. The plugin is compatible with bbPress, as well as many popular plugins with frontend user registration and profile management features.
Admins can upload a user’s avatar on the Edit User admin screen.
Basic User Avatars also supports front-end avatar management for sites that want to keep users out of the dashboard. To use this feature, add the shortcode <code>[basic-user-avatars]</code> to any page in your WordPress site. We recommended placing this shortcode on another logged-in account type page, such as the WooCommerce My Account page, the Membership Account page, or any other front-end profile edit form.
The Avatar Upload form is automatically added to the bbPress User Profile > Edit frontend page.
If you do not want your users to be able to update their avatar, navigate to Settings > Discussion and locate the “Local Avatar Permissions” setting. Check this box to only allow users with file upload capabilities to upload local avatars (Author role and above).
<h4>Seamlessly Migrate from WP User Avatar Plugin</h4>
Version 1.0.5 includes a feature to automatically convert avatars formerly loaded through the WP User Avatar plugin. This means that you can disable WP User Avatar, activate Basic User Avatars, and have a seamless transition for existing avatars in your site. Be sure to update any avatar upload form that used the <code>[avatar_upload]</code> shortcode to use the shortcode: <code>[basic-user-avatars]</code>.

Basic User Avatars

it may have been around for a while but this plugin still works well

still works with WP4.9.1

Add an avatar upload field on frontend pages and Edit Profile screen so users can add a custom profile picture.

Restrict User Content vs Basic User Avatars