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i found by accident project named ycad on sourceforge ,it's a java library that can be ued with other java based programes to open .dxg files , i don't know if that can help.
Can't QCad help?! it's GPL, reads and writes .dxf and is under constant development (I think!).
Sorry I didn't realize the point at first!! So please ignore my first message.
Removed as I added the reference at Feature Request 2376538.