As Europe strives for greater digital independence, open source is emerging as a key enabler of digital sovereignty. Reliance on proprietary software and foreign tech giants poses significant risks to security, privacy, and economic resilience. This presentation will explore how open-source technologies empower governments, businesses, and institutions to regain control over their digital infrastructure. By leveraging open standards, community-driven development, and transparent governance, Europe can build a more secure, innovative, and self-sufficient digital ecosystem. Nextcloud serves as a prime example of how a European open-source company can successfully provide a viable alternative to big tech, proving that digital sovereignty is not just an ideal but a reality. However, despite the availability of open-source solutions, the political will to implement them at scale is often lacking, hindering true digital independence.