Mozilla Fest 2025 , Decidim Fest 2025 and the second edition of the 4D European Conference made the city of Barcelona vibrate. Under the name 'Barcelona Open Tech Week 2025' , the three events focused on technology as a common good. First, last Tuesday, October 28, the second edition of the 4D European Conference became a day of debate and action on how to make truly democratic digitalization possible at the service of people and fundamental rights. Then, on November 4, 5 and 6, Decidim Fest 2025 filled the Canòdrom. The Ateneu d'Innovació Digital i Democràtica. posing how digital public infrastructures can be reconfigured and rethinked so that they contribute to social transformation and at the service of democratic governance, citizen participation and social justice. The aim of the successful event was to collectively imagine and build digital infrastructures that are open, democratic and rooted in the common good. Within this framework, the process to develop the City Pact for Digital Rights and Democratic Technologies was initiated, presenting a first draft of the Barcelona City Council initiative and inviting organizations, professionals and citizens to form part of the different specific working groups on open data, artificial intelligence or open technologies.
Finally, on November 7, 8 and 9, Mozilla Fest 2025 offered spaces with high-level speakers to shape creative and transformative ideas and promote a more open, inclusive and human rights-committed digital world. Among others, Ruha Benjamin, sociologist, and Nabiha Syed, executive director of the Mozilla Foundation, spoke about the importance of unlearning, from the biases rooted in digital worlds to the myths that shape laws and institutions, and proposed unlocking new ways of thinking and building. Also, Annelie Berner, specialist in data design and artistic research, and Monika Seyfried, artist and winner of the 2022 Science Breakthrough Prize, spoke about data storage, the ecological impact of current technologies and the potential of alternative technologies based on nature. Likewise, speakers Alix Dunn, Justin Hendrix, Pablo Jiménez, Tessa Pang and Pau Penya addressed how data centers, with their large demand for energy, water and land, are transforming landscapes, economies and ecosystems around the world and connected these realities with community action.