A WordPress plugin I designed and developed myself, live on viraseo.com: clients configure their project (site type, modules, SEO package, languages, content) and instantly receive an itemised price estimate and a generated proforma invoice. A real software product in daily client use. Deliverables: itemised cost calculator, automatic proforma-invoice PDF generation, admin settings panel for prices and packages. Live page: https://viraseo.com/cost-of-website-design-online