The document outlines various app challenges organized by Waag Society, highlighting the outcomes and impacts of hackathons aimed at developing applications for social good in Amsterdam and other cities. Key statistics include the creation of 47 apps within 30 days for a cost of €50,000, with an estimated generated value of €2.3 million. It emphasizes the importance of open data availability, citizen engagement, and the potential for new applications to address public needs and improve government transparency.