OrbisCAD
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OrbisCAD is the community precise cartography editor which allows reading shapefiles, postGIS, DXF, DGN (7.0) and DWG (2000) and writing shapefiles and postGIS. It can access any vectorial format since it is built upon GDBMS
OrbisCAD is a plugin driven application so it can be extended by writing plugins, creating editing tools, scripting and vectorial format drivers.
It is planned to give OrbisCAD raster support through GDAL and increase the supported vectorial formats by integrating with OGR.
