AletheiaFact.org is a movement for the democratization of fact-checking in Brazil, which aims to empower ordinary citizens to check and monitor information in order to prevent the harmful spread of fake news and create a digital community engaged in teaching, learning and sharing knowledge on the subject. We are also a technological platform that offers tools in workflow format to make fact-checking processes accessible and feasible for everyone. In an era where misinformation can spread rapidly, establishing robust and reliable fact-checking platforms is crucial. This presentation delves into the unique journey of developing a Free and Open Source Software (FOSS) fact-checking platform specifically for the Brazilian community. We explore the intersection of technology, journalism, and civic engagement in the context of Brazil's diverse and dynamic information landscape. Brazil, with its rich cultural and linguistic diversity, presents unique challenges in misinformation management. Our project aims not only to address these challenges but also to harness the power of the open-source community in creating a transparent and accountable fact-checking tool. We will discuss the technical hurdles in building a scalable and effective platform, including aspects like real-time data analysis, integration with various media formats, and ensuring user-friendly interfaces that cater to a broad audience. Additionally, we focus on the vital role of community engagement in the development and adoption of the platform. The talk will cover strategies for fostering an active open-source community around the project, encouraging collaboration, and ensuring the platform evolves in response to the community's needs.