Explore Mozilla's DeepSpeech and Common Voice projects in this 27-minute conference talk presented by Tilman Kamp at FOSDEM 2018. Dive into the world of open and offline-capable voice recognition technology, learning about the motivations behind these initiatives and their potential impact. Gain insights into scaling challenges, user perspectives, and the technical aspects of preparing the environment and working with data. Discover the development process, including data preparation, contribution methods, and the importance of open data. Examine specific topics such as loss propagation, overfitting, and the differences between acoustic and language models. Understand the application of these technologies to different languages, with a focus on German corpus development and training. Conclude with next steps and ways to get involved in these groundbreaking projects.