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I was thinking on tools/plugins for QGIS, but other good suggestions are welcome.

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The OpenStreetMap (OSM) editor JOSM is a great tool for digitising. Although it is specifically developed for editing data in OSM it can save data as .osm or GeoJSON files which can then be converted to other GIS formats (e.g. using ogr2ogr). This export facility converts it into a good general purpose digitising package.

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QGIS does it, as it can digitize with (pseudo)topology. Beside the core tools to digitize, there are a number of extensions that can help the user.

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could you name some, please? – vascobnunes Oct 19 '11 at 13:21
Routing by Underdark - all credit goes to her. Note: digitise normally for road (or use osm data) then create the network with postgres and use pgrouting to do the network topology. – Mapperz Oct 19 '11 at 13:39
Naming a few QGIS 3rd party plugins that add tools to the standard editing toolbars: freehand editing, traceDigitize, Numerical Digitize, Numerical Vertex Edit, CadTools, Rectangles Ovals Digitizing, Rectangles Ovals and Diamonds, qgsazimuth, improved polygon capturing, join lines, point2one, ... – Giovanni Manghi Oct 25 '11 at 18:44

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