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Im looking for alternative ways for analyse my network dataset. So, there is another way to analyse an GIS network? I mean if there are any useful plug-in capable to determine service areas, routes, or even VRPs like Arcmap does? Road Graph plugin can do all this stuff?

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Use PgRouting. PgRouting works with PostGIS and so it falls into your category of "another OS GIS". Underdark has created a whole suite of tutorials (including installation instructions) here. A search on this site for pgrouting will generate a lot of other discussion, links and tips.

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