are you looking for raster or vector based stuff?
However, look briefly into this article (it is the TANATO stuff) -
http://conference.osgeo.org/index.php/foss4g/2008/paper/view/282/177

and these pages:
http://brehat.ec-nantes.fr/avupur/doku.php?id=exploitation_du_graphe_-_indicateurs
http://geosysin.iict.ch/irstv-trac/browser/platform-contrib/jdelaunay.

Should be possible to use the code for OpenJUMP instead of OrbisGIS - if you want.

An interesting reference is also the stuff of Tarboton's TauDEM. Sextante may be another option for Raster analysis. You will find the references to both in Table 4 of my article here (it is under review):

http://www.geo.uzh.ch/publications/sstein/sstein_freegitools4Lecology_v5_2009webv.pdf

stefan

Sérgio Ferreira Jr. wrote:
Hi Stefan

Yes, I know about OpenJUMP but preferred search the source. :)

If you know other tools can send me the link.

Want to customize some of these tools.
Thanks


--

Sérgio Ferreira Jr.
    S.Júnior


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