WP Custom Fields is a WordPress options framework that I developed from scratch using PHP and JavaScript. It’s used in all the themes I created.

WP Custom Fields is also used by this website

It allows developers to add additional fields through custom meta boxes at Pages, Custom Posts, Users & Taxonomies. It also helps developers to easily create WordPress Options Pages and Customizer fields.

Example of a theme settings screen created with WP Custom Fields

WP Custom Fields is available on GitHub.