How do i convert .dwg to .dxf with free software?

Solution 1:

ODA File Converter

(Formerly known as Teigha File Converter)

This is 'free as in beer' software however I have no other alternative.

There is a DEB package for installing on Ubuntu 32-bit.

However, for Ubuntu 64-bit users, like myself, you are relegated to downloading the Windows installer and using Wine to install it. Note that you will need Wine version >= 1.3.5 otherwise MSVC++2010 installer crashes.

Solution 2:

There is Draftsight, currently in beta on Ubuntu. I've used it on Windows and it look pretty good for a free (of cost) app

Solution 3:

Just use Autocad's webapp:

https://app.autocad360.com

Upload your .dwg (you can even view or edit) then download as .dxf.