This is a dynamic, fast-paced talk designed for developers and GIS enthusiasts. We will quickly navigate through 30 diverse open source geospatial APIs, dedicating about a minute to each. Covering a range of functionalities from basemap providers to specialized data services, attendees will get a snapshot of each API's key features, use cases, and integration tips. Attendees will gain valuable insights into the vast landscape of geospatial tools, understanding how to leverage these APIs in various projects for enhanced mapping and data analysis. Together we'll explore the vast array of open source geospatial tools available, showcasing their diverse applications and capabilities.