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I have a set of features of type linestring. I'm trying to polygonise the linestrings and assumed that they were closed (naive me :) ). Of course some were not closed and I'm trying to locate the gaps or the endpoints of the individual linestrings, so I can close them manually.

Question:
How can I locate the gap in or endpoints of an open linestring?

Available software: QGIS, FME, OpenJump, (ArcMap).

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I found that the Sextante toolbox in OpenJump has the Extract endports of lines method. It does the trick, but OpenJump runs out of memory all the time, which is very annoying. I remember something about QGIS having the Sextante toolbox, but I could not find it. – Chau Feb 6 at 16:03

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