WordPress is the most popular free Content Management System (CMS). It is constantly updated and modernized. The developer community has already created over 100,000 free extensions. There are also plenty of paid plugins. The creators of WordPress were trusted by, among others: IBM, Microsoft< /a>, White House, Facebook , Mercedes-Benz, Usain Bolt, Volvo Dealer Network, Poczta Polska ,  Zespół KULT and many others.