Free web viewer for 3d building geometry.
For great visual effects and large amount of 3d objects.
Supports most of OpenStreetMap tagging schema.
OSM Buildings Classic
2.5d Map layer for Leaflet.
Best compatibility with all systems.
Blends seamless into existing web maps.
World wide building data
GeoJSON for almost any GIS application.
Vector Tiles compatible with Mapbox GL.