Blighty

This plugin monitors installed WordPress plugins on your installation. It notifies the admin (or other email) when updates are available. Plugins can be excluded from monitoring.

Blighty Pluginator

This plugin monitors installed WordPress plugins on your installation for updates and notifies via email when they are available.

gr8nilay

This plugin is use to disable all your theme updates as well as notifications for the same. It will prevent your wordpress to check for new updates for each theme. This plugin is ideal for whom who have customzied the theme and won’t loose their customization at time of update.
Read This First: 
You need to keep your WordPress updated with themes and plugins so if you fail for the same then it will might compromise security of your site.

Disable WP Theme Updates Advance

Easy to install and automatically disable all theme updates.



Nice..!!

Disable all your WordPress theme updates on plugin activation.

Blighty Pluginator vs Disable WP Theme Updates Advance