The third dimension is a growing topic at OSM. It's already possible to add detailed buildings and a lot of minor objects, which results in a 'feeling like home'.
If you just want to browse 3D city models, you can view them with multiple tools:
|Screenshot||OSM Wiki Link||External Link||Description||Freely Licensed?||Application Type|
|F4 Map||Map||WebGL realtime render - with fountains, trees, meteo, shadows based on real sun/moon position||nonfree - terms at the bottom of their site in French||Webapp|
|blender-osm||A Blender plugin||pay-for-source (once paid, licensed under GPL [version not specified])||Desktop (plugin)|
|Generation Streets||A video game and a separated command-line tool||Video game: proprietary,
Command-line tool: free, licensed under BSD
|Kendzi3d||3D Renderer part of JOSM Map editor||free probably - claims BSDv3 but does not include license file||Desktop|
|OSM2World||free - GNU LGPL||Desktop|
|Blicky||Map||Seems to be offline||?||Webapp|
|MapSurfer||only building heights||?||Webapp|
|OSMBuildings||WebGL viewer - also available as Classic Version for visualizing on interactive maps||?||Webapp|
|OSM-3D.org||Map||Only building heights.
Needs Java-plugin 1.6 or older to show.
|WikiMiniAtlas||Map||Integrated in Wikipedia.||free - GPLv3+||Webapp|
|Vizicities||WebGL dynamic OpenStreetMap visualisation platform + live transport and data overlays||free - BSD 3-clause||Webapp|
|OSG-Maps||Android (Play Store)||for Android||?||Mobile|
|MAPS.ME||for Android/iOS||free - dual-licensed under Apache License 2.0 and Open Database License.||Mobile|
Quick access to demonstration areas are also available on the Simple 3D Buildings page. A similar list of map applications can be found on Simple 3D buildings page.
For artists, it might be interesting to get city models in common 3D formats as .OBJ
The process of detailed recording your environment for later modelling is called micromapping in general. To get a lot of details very quickly, the Photomapping technique is recommend.
Instead of taking your own photos (from top of tall buildings), you can watch for your area at Wikipedia Commons or ask e.g. Wireless Community networks. Some further image services, which are worth to check:
To enter the data of your city, you can use OSM itself, or use an external storage.
Additional list of 3D tagging applications can be found on Simple 3D buildings page.
You are interested in embedding 3D functionality in your own software?
- Template:User 3d - if you like 3D and want to show it on your wiki userpage