The development of the Akkerweb service platform was started around 2010. It is an open data platform for precision farming, providing maps, services, data, decision support and connections required for, in principle, any precision farming application envisioned. This includes background maps, services for weather data, satellite images, soil maps, crop polygons, etc., but also visualisation tools, a store, a task map generator and crop growth models. Akkerweb provides the infrastructure needed to easily develop an application using the available services and publish it on the Akkerweb platform. Moreover, Akkerweb applications can also run on other websites, seemingly as stand-alone applications with the look and feel of the customer’s website. Akkerweb/FarmMaps have decision support tools for soil moisture and crop growth monitoring, nitrogen top dress application, potato haulm killing and late blight control in potatoes. Irrigation, soil herbicide use and nematode management in arable crops on Akkerweb/FarmMaps are presented. Results of use of the decision support in on-farm research are given.