Here is the description for the BNS Add Widget plugin:
Add a widget area to the footer of any theme. Works just like the widget areas commonly created with code in the functions.php template file.
It essentially just adds a widget area to the footer of any theme by “hooking into” the standard WordPress function
wp_footer(). This plugin will allow other plugins, like my BNS Corner Logo, to work when the active blog theme does not have its own built-in widget areas.