TL:DR; DWG DXF to PDF Converter allows you to convert your dwg to pdf, and dxf to pdf in batches.
DWG DXF to PDF Converter allows you to convert your dwg to pdf, and dxf to pdf in batches.
Simple, powerful and inexpensive CAD software for surveying. You can do triangulation, isolines, color-filled contour maps, sections, intersections, volume, simulation of rainwater runoff and editing XYZ files.
DWG Recovery Toolbox provides friendly image recovery services for engineers and other users working in AutoCAD. This program allows repairing DWG files, it makes sense even some backups are available, this tool recovers the latest modifications.
Copan for PocketPC allows you to COGO (coordinate geometry), process field surveys, adjust map traverses, perform map/deed checks, calc curves and areas/perimeters, transform coords, interface with GPS, and import/export Ascii files. It's free.