hsCADence 

hsCADence is a CAD document conversion tool. It converts to/from DWG/DWF/DXF, supports six different CAD file versions (r12, r13, r14, AutoCAD 2000, 2004, 2005), exports to PDF, BMP and JPEG, and supports command line scripting and batch processing.
cad autocad dxf dwg pdf convert jpeg bmp image 3d 2d pan rotate

Blaze ImgConvert 

Advanced batch image conversion supporting over 140 formats and an entire arsenal of options and features. Comprehensive support for compression, sub-formats, color depths, naming templates, and resizing/rotating in the same operation are available.
convert conversion resize rotate image graphics colorspace color depth multi-page rename afp ani awd bmp