Do you want to avoid writing boilerplate code for map applications? Would you rather take a ready-made template for your apps and start hacking away the cool stuff? Oskari and RPC may be just what you're looking for! Oskari is an extensible and versatile map application platform which provides an easy user-interface for creating embeddable maps to websites. Embedded maps can be controlled from the website with an API to create innovative and user-friendly applications. The API includes features that allow you to 'visualize data' on the map and/or 'react to user interaction' with the map, allow users to give feedback by 'drawing on the map' or create a custom trip planner with routing features. The API can be easily extended by adding features to Oskari platform. Oskari has been originally developed by the National Land Survey of Finland, but now being developed and used by multiple organizations, also internationally. There are numerous websites already making use of embedded maps, including Finnish national e-services.