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Is there any 'Auto-complete polygon' tool in QGIS, similar to the one existing in ArcGIS?

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Yes, you can set snapping tolerance (e.g. to vertex and segment) you can then over digitize. A new polygon will only be created to the edge of an existing polygon. This setting can be enabled through the Settings Menu> Project Properties> General tab.

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Just an update for version 1.8.0-Lisboa: This setting was moved slightly, to Settings>Snapping Options... –  ChrisHamby Apr 26 '13 at 18:53
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