thewebsitesupply

This plugin automatically runs updates for the security of your WordPress minor and major core version, plugins, and themes. It will also email you when a plugin is updated so you can verify that nothing on your website has broken.
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Graphic Web Design, Inc. Manager

This plugin helps keep my website secure and everything updated.

Automatic security updates

This plugin automatically runs updates for the security of your Wordpress minor and major core version, plugins, and themes.

Jon Tejnung

This plugin will give you three alternatives for managing your WordPress updates:
<ul>
<li>Update automatically – This updates WordPress/themes/plugins automatically and sends an email to the site admin when an update has been performed.</li>
<li>Update automatically (no email) – Same as the first alternative, but without the email.</li>
<li>Inform about updates once a week – This will send an email to the admin once a week if there are anything that can be updated.</li>
</ul>
Notice that only plugins/themes that resides in the WordPress 
repository will be updated/informed about.
The plugin has not been tested and is not primarily made for multi site-installations.

Simple Automatic Updates

Activate automatic updates or weekly notifications for the site.

Graphic Web Design, Inc. Manager vs Simple Automatic Updates