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Polygon
Polygon eases the handling of 2D-polygons including very fast clipping operations...
Wx::Polygon
Wx::Polygon can draw and manipulate polygons for wxPerl....
Kig
Kig is a program created for exploring geometric constructions....
KRoots
Finds roots of a complex number and graphs...
Points2One
QGis plugin for creating polygons or polylines from vertices...
polylines polygons create polygons QGis plugin create polylines