GitHub - piatkowski/wckalkulator: WC Kalkulator is a WordPress plugin which extends the WooCommerce to use custom fields with products and orders. Custom fields can be used to calculate a custom product price.
Piszemy prosty kalkulator w C#.NET - moja wersja
Product Fields, Addons and Price Calculator for WooCommerce – WordPress plugin | WordPress.org
Pierwsza Aplikacja w C# – Programujemy Kalkulator - Modest Programmer