Explore the trends of Content Management System (CMS) usage on official city websites with a comprehensive study spanning 466 cities worldwide. The research delves into the prevalence of open-source solutions, highlighting the dominance of WordPress, Drupal, and other platforms. The report categorizes findings based on city size, region, and EU membership, revealing intriguing patterns and insights. The study raises essential questions about the adoption of open-source systems in the public sector, shedding light on challenges and opportunities for promoting transparency and cost-efficiency in digital governance. Dive into the detailed analysis to understand the global dynamics of CMS choices in city administrations.