OpenStreetMap has launched OpenStreetView, an open-source alternative to Google Street View.
Results are starting to appear on OpenStreetView’s map. Browse to a city with some coverage – San Francisco is a good place to start – and recorded tracks are highlighted in purple.
You’re able to zoom in on any area of interest, click a location, then step through the route.
These are just stills, and you’re not able to change your viewpoint as in Google Street View. Coverage is going to be patchy for a long time, too.
On the plus side, if it takes off then OpenStreetView’s imagery should be much more up-to-date than the Google equivalent, and that’s going to be a major advantage.