Polylang and Option-Tree bridge, that allows you to have different theme options for each language.
By using this plugin you can manage custom meta boxes from admin side.
Redux Converter allows you to get going with Redux Framework almost instantly. Just install and run in a theme using one of the supported frameworks,
Adds Option Tree fields for linking Gravity Forms to Option Tree, allowing you to select a specific form for an option.
Add a [ot_get_option] shortcode to the WordPress editor to include data from OptionTree.