We use OpenLayers at our company. We are building an interactive map with a bunch of tools for measuring distance, calculating routes, drawing features, display

We use OpenLayers at our company. We are building an interactive map with a bunch of tools for measuring distance, calculating routes, drawing features, displaying diagrams right on top of the map, and OpenLayers is doing wonders for us. It has a steep learning curve but once you grasp the fundamentals, you can figure out how to do all kinds of magic tricks with it.