That is a great question that we commonly receive. There are some EasyGerb customers who use AutoCAD LT along with this product (see link below):
Note: We don't endorse any third party tool and recommend you give it a try before buying it.
Note: LT users may also want try our stand alone product: ACE Translator 3000. The interface is similar to EasyGerb and converts AutoCAD DXF (and DWG) to Gerber.