DanCoulter

With a quick activation, you can receive a daily email if you have any plugins that need updating. If no plugins have pending updates, you will not receive an email at all. If you don’t upgrade, the plugin will keep nagging you until you run the updates.

Plugin Update Notification

Receive a daily email if you have any plugins that require updating.

PasqualePuzio

This plugin sends an email to the administrator for each login. The goal of this plugin is to improve the security of your website and keep under control all the accesses to your website.
You can customize the email template and exclude from notifications the admin access.
For further information and support contact me visiting my website or the official plugin support page: 
– <a href="http://www.pasqualepuzio.it" rel="nofollow ugc">WordPress Consultant & Specialist</a> 
– <a href="http://www.pasqualepuzio.it/plugin-wordpress/login-alert/" rel="nofollow ugc">WordPress Login Alert Plugin/a></a>

Login Alert

This plugin sends an email to the administrator for each login.

Plugin Update Notification vs Login Alert