Has anybody of you experiences with QGIS for modelling DTMs?
Yes, we have. But linked GRASS is more appropriate for complicates tasks, but, in principle there are some tools for morphological analysis in QuantumGIS and we have some experience with it. Also we can create additional modules for QGIS and some p[ersons form our GIS Center know Python too :))
Polat R. Reymov
GIS Center of Karaklpak State University