Masahiro NAKASHIMA

If this plug-in is enabled, and there is a file on the same theme level as the static page URL level, then that theme file will automatically be loaded as the template file.
Example 
For the static page URL: “http://example.com/foo/bar/” 
Theme directory: “/wp-content/themes/mytheme/foo/bar/index.php” 
will be loaded as the template file if it exists.
*If enabled themes have a parent-child relationship, then the file for the child theme will be loaded with precedence.

Auto Load Page Template

If this plug-in is enabled, and there is a file on the same theme level as the static page URL level, then that theme file will automatically be loade …

John P. Bloch

Create child themes from any non-child theme with the click of a button.
This plugin is multisite compatible; if used on a multisite network, controls for creating child themes will be in the network admin instead of the regular site admin. Pick the parent theme from the dropdown and name name your new child theme. You can also change the author name and select files you want to copy from the parent to the new theme.
Click the button and you’re all set!

Child Themify

Create child themes with the click of a button.

Auto Load Page Template vs Child Themify