Sergey Biryukov

Automatically includes a parent theme RTL stylesheet for a child theme if it doesn’t have its own <code>rtl.css</code> file.
Thanks to <a href="http://www.wp-tricks.co.il/" rel="nofollow ugc">Rami</a> for the idea.

Include Parent Theme RTL CSS

Allows to include a parent theme RTL stylesheet for a child theme.

Raul Illana

WPmercs

Mercenary Parent Theme Modifications Automatic Importer for Custom Child Themes
Import your Parent Theme modifications into your Child Theme quick and easy!

Include Parent Theme RTL CSS vs Mercenary Theme Modifications Automatic Importer