SumoCoders is a web design firm in Ghent that participated in a hackathon two years ago where their app Wakankdoen.be won and unintentionally caused problems by making Ghent too crowded. To address this, they built HoeDrukIst.nu to show how crowded different areas of Ghent are in real-time using various data sources like parking availability, weather, Instagram, and Twitter posts. They analyze this data to assign red color levels to each area to indicate relative crowd levels. Their goal is to improve the algorithm over time with more data sources and provide predictive analytics and notifications to users.