Is anyone using open source tools and/or data to generate drive time polygons that radiate out from a given location? For example, I have used ESRI products like Network Analyst and Business Analyst to generate polygon boundaries that represent the maximum distance one can travel along a road network from a given point within a user defined period of time (say 5, 10, and/or 15 minutes). Are there any similar open source or web-based alternatives?
I saw this post, but it really doesn't give alternative options: http://gis.stackexchange.com/questions/46/can-you-make-a-travel-region-polygon-with-with-google-maps-api
I was particularly curious to know if anyone is (or can) use OpenStreetMap to do drive time analysis?
Also, is there any implementation of the pgRouting utilities that could be used to generate polygons? http://pgrouting.postlbs.org/